Spin-orbit coupling and dimensionality at the heart of quantum magnetism of heavy transition metal oxides
Lead Research Organisation:
Science and Technology Facilities Council
Department Name: ISIS Pulsed Neutron & Muon Source
Abstract
This proposal is focused on the study of quantum materials with competing interactions. Measurements of the various quantum-mechanical phases provide the most direct manifestation of the underlying abstract physics, such as quantum spin liquid, topological behaviour and quantum entanglement. The in-depth experimental and theoretical investigations of emergent phenomena of the candidate quantum materials have been serving as a major theme of recent condensed matter physics research. Understanding the complex magnetic interactions in these novel quantum materials is crucial for the development of fundamental science in the form of modern theory of higher d transition metal oxides, as well as for the strong foundation of alternative pathways towards the design of new and exotic materials and functional devices, which hold true promise for future generation of technological applications. The investigations on the novel 5d Iridates and 4d rhodates reveal a burgeoning list of theoretical proposals as well as predictions of unusual states, such as Jeff half Mott-insulating state, the quantum spin liquid phase, Kitaev quantum magnetism, unconventional superconductivity, Weyl semimetals, correlated topological insulators, etc., which are indeed truly remarkable and stimulating. The physics of iridates, ruthenates and rhodates clearly warrants serious intellectual challenges both theoretically and experimentally, and hence, in this proposal we focus on design, synthesis and characterisation of the new candidate quantum materials within 4d Rh/Ru- and 5d Ir-based oxides. Quantum spin liquid (QSL) is a novel state of quantum magnetism where long range magnetic order is suppressed due to strong quantum fluctuations down to the lowest temperature. The gapless QSLs exhibit long-range quantum-entanglement and fractionalised spin excitations named as Majorana Fermions. Such fractionalised spin excitations are different from conventional magnons observed in compounds with long-range magnetic ordering. The present proposal is therefore aimed to investigate the exotic and unconventional magnetic ground states of iridates, ruthenates and rhodates within a variety of crystal structures and lattice geometries by implementing detailed experimental study (both laboratory based and state-of-art neutron, muon and x-ray synchrotron based advanced measurements) and ab-initio electronic structure calculations. These in-depth investigations will help in understanding the importance of various competing interactions, e.g. spin-orbit interaction, on-site Coulomb U, crystal field, Hund's coupling, hopping and electronic bandwidth. The nature of the extraordinary structural sensitivity of quantum materials also calls for extraordinarily high-quality single crystals and we are planning to synthesise such single crystals using UCL crystal growth lab at Harwell and investigate them using various central facilities.
Organisations
- Science and Technology Facilities Council (Lead Research Organisation)
- Tohoku University (Collaboration)
- Max Planck Society (Collaboration)
- University of Warwick (Collaboration)
- Institut Laue–Langevin (Collaboration)
- University of Johannesburg (Project Partner)
- University of Warwick (Project Partner)
Publications
Aarti
(2024)
Time-reversal symmetry breaking in the s -wave superconductor CaPd 2 As 2 probed by µ SR
in Physical Review B
Adroja D
(2024)
Magnetic and Magnetoelectric Materials
in Magnetochemistry
Amorese A
(2022)
Metamagnetism and crystal-field splitting in pseudohexagonal CeRh 3 Si 2
in Physical Review B
Anand V
(2023)
Role of crystal-field ground state in the classical spin-liquid behavior of the quasi-one-dimensional spin-chain system Sr 3 NiPtO 6
in Physical Review B
Anand V
(2024)
Effect of annealing on the electrical resistivity of Kondo lattice CeRh 2 Ga 2
in Physica Scripta
Anand V
(2023)
Time-reversal symmetry breaking and s - wave superconductivity in CaPd 2 Ge 2 : A µ SR study
in Physical Review B
Anand V
(2022)
Thermal conductivity, thermoelectric power and Mössbauer investigations on atiferromagnetic CeFe1.7Ir0.3Al10
in Journal of Magnetism and Magnetic Materials
Anand V
(2023)
Magnetic structure and crystal field states of Pr 2 Pd 3 Ge 5 : µ SR and neutron scattering investigations
in Physical Review B
Bairwa D
(2025)
Quantum spin liquid ground state in the rare-earth triangular antiferromagnet SmTa 7 O 19
in Physical Review B
Bandyopadhyay A
(2024)
Gapless dynamic magnetic ground state in the charge-gapped trimer iridate Ba 4 NbIr 3 O 12
in Physical Review Materials
| Description | We have identified new quantum spin-liquid (QSL) material based on heavy transition metal using muon spin rotation and relaxation measurements. In this material magnetic frustration plays important role, which enhances quantum fluctuations and prevents a long-range magnetic ordering of the strongly correlated spins down to lowest temperature. Investigations of materials hosting QSL ground states are of immense importance in the context of understanding the mechanism of high-temperature superconductivity, as well as for possible applications in data storage, memory devices, and future generation quantum computation. |
| Exploitation Route | Investigations of materials hosting QSL ground states are of immense importance in the context of understanding the mechanism of high-temperature superconductivity, as well as for possible applications in data storage, memory devices, and future generation quantum computation. |
| Sectors | Chemicals Digital/Communication/Information Technologies (including Software) Education |
| URL | https://arxiv.org/pdf/2403.06446.pdf |
| Title | Crystal-field excitations in the spin-liquid candidate on a rare-earth based Jeff=1/2 square lattice antiferromagnet NaNdTiO4 |
| Description | Quantum spin-liquid (QSL) refers to a highly entangled state wherein strong frustration-induced quantum fluctuations prevent phase transitions at T?0 in magnetic materials despite strong exchange interactions between spins. QSLs are ideal hosts of exotic fractional quantum numbers coupled to emergent gauge fields and hold tantalizing prospects for applications in fault-tolerant quantum computing. The experimental realization of QSLs in two-dimensional spin-lattice remains elusive in view of the presence of defects and anti-site disorder in real materials. Rare-earth-based frustrated magnets provide a novel route for exploring the enigmatic QSL state with fractional magnetic excitations. The recently synthesized structurally perfect square lattice antiferromagnet NaNdTiO4 seems a very promising QSL candidate, as confirmed by a series of macroscopic measurements. The localized Nd3+ spins show neither magnetic order nor spin-freezing state down to 1.9 K. Thermodynamic data reveal an effective Jeff = 1/2 (Nd3+) in the Kramers doublet state and an antiferromagnetic interaction between Jeff = 1/2 moments. This calls for a very sensitive local probe such as inelastic neutron scattering that could unambiguously establish the ground state and associated magnetic excitations. We propose to carry out INS studies to study the crystal field excitations, single-ion anisotropy and to probe the energy and wavevector dependence of the dynamic structure factor in NaNdTiO4. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | impact is on Quantum computing fiend as this material exhibit quantum spin-liquid ground state |
| URL | https://topcat.isis.stfc.ac.uk/doi/INVESTIGATION/121904381/ |
| Title | Crystal-field excitations in the spin-liquid candidate on a rare-earth based Jeff=1/2 square lattice antiferromagnet NaNdTiO4 |
| Description | Quantum spin-liquid (QSL) refers to a highly entangled state wherein strong frustration-induced quantum fluctuations prevent phase transitions at T?0 in magnetic materials despite strong exchange interactions between spins. QSLs are ideal hosts of exotic fractional quantum numbers coupled to emergent gauge fields and hold tantalizing prospects for applications in fault-tolerant quantum computing. The experimental realization of QSLs in two-dimensional spin-lattice remains elusive in view of the presence of defects and anti-site disorder in real materials. Rare-earth-based frustrated magnets provide a novel route for exploring the enigmatic QSL state with fractional magnetic excitations. The recently synthesized structurally perfect square lattice antiferromagnet NaNdTiO4 seems a very promising QSL candidate, as confirmed by a series of macroscopic measurements. The localized Nd3+ spins show neither magnetic order nor spin-freezing state down to 1.9 K. Thermodynamic data reveal an effective Jeff = 1/2 (Nd3+) in the Kramers doublet state and an antiferromagnetic interaction between Jeff = 1/2 moments. This calls for a very sensitive local probe such as inelastic neutron scattering that could unambiguously establish the ground state and associated magnetic excitations. We propose to carry out INS studies to study the crystal field excitations, single-ion anisotropy and to probe the energy and wavevector dependence of the dynamic structure factor in NaNdTiO4. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | This a beam time proposal at ISIS facility. The impact will be on increasing neutron and muon user community at ISIS Facility. Also the work will be a part of PhD student's thesis. |
| URL | https://topcat.isis.stfc.ac.uk/doi/STUDY/121904389/ |
| Title | Determination of ground state magnetic structures in the strongly spin-orbit coupled iridate double perovskites Pr2-xSrxMgIrO6 (x = 0, 0.5) |
| Description | ILL beam time proposal and impact is on the high quality output from the ILL instruments. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | ILL beam time proposal and impact is on the high quality output from the ILL instruments. |
| URL | https://doi.ill.fr/10.5291/ILL-DATA.5-31-3035 |
| Title | Investigation of possible quantum spin liquid ground state in 6H-hexagonal perovskite d5 iridates Ba3M4+Ir24+O9 (M=Ti, Zr) using Muon spin r |
| Description | ISIS Facility beam time proposal and impact is on the high quality output from the ISIS instruments. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | ISIS Facility beam time proposal and impact is on the high quality output from the ISIS instruments. |
| URL | https://topcat.isis.stfc.ac.uk/doi/STUDY/121903950/ |
| Title | Investigation of possible quantum spin liquid ground state in 6H-hexagonal perovskite d5 iridates Ba3M4+Ir24+O9 (M=Ti, Zr) using Muon spin r |
| Description | The 6H-hexagonal perovskite iridates Ba3M4+Ir2O9 with Ir4+ ions located on the vertices of a triangular lattice have been serving as the potential paradigm in search for the novel quantum spin liquids and other exotic quantum magnetic ground states. The M= Ti and Zr demonstrate absence of magnetic ordering via featureless paramagnetic-like dc susceptibility curves as well as missing anomaly in the specific heat data, despite having considerable antiferromagnetic Ir-Ir exchange interaction, thus marking both these d5 iridates as candidate materials for exhibiting strongly spin-orbit entangled dynamic quantum spin liquid ground states, which therefore warrants in-depth local probe muon-spin-relaxation/rotation (?SR) investigations to ascertain the true quantum magnetic ground states and consequently, to authenticate(refute) the dynamic(static) nature of the Ir-magnetic moments. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | ISIS Facility beam time proposal and impact is on the high quality output from the ISIS instruments. |
| URL | https://topcat.isis.stfc.ac.uk/doi/INVESTIGATION/124326539/ |
| Title | Novel ground state in the frustrated S=1 tetramer antiferromagnet K2Ni2(MoO4)3 |
| Description | Quantum materials wherein frustration, the topology of the electronic band structure, spin correlations, and subtle interplay between emergent degrees of freedom are at play can host a panoply of novel quantum states spanning from spin liquids to Bose-Einstein Condensation with exotic fractionalized excitations. Herein, we focus on a new frustrated antiferromagnet K2Ni2(MoO4)3 in which Ni2+ ions constitute a tetramer. The magnetic susceptibility and specific heat on the single crystal and polycrystal exhibit short-range spin correlations without a gap in the spin excitation spectrum. The presence of a sharp peak at around ~ 1.1 K in magnetization and specific results suggest the presence of long range magnetic order. Remarkably, the external magnetic field induces magnetic phenomena akin to the BEC of triplon excitations in spin gap magnets. T-H phase boundary follows a power law (T-T_N)?H^(2/3) as predicted for the BEC scenario. Our thermodynamic results suggest the titled material is located in the proximity of a quantum critical point (QCP), which separates the magnetically ordered and spin-gap regions of the phase diagram. We propose a µSR study much below the sub-Kelvin temperatures to unambiguously confirm the BEC state, extract the relevant order parameter, and critical exponents essential to establish universality class in BEC of magnetic excitations in this novel frustrated antiferromagnet. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | ISIS beam time proposal. The impact will be on the high quality output from the ISIS instruments. The work is a part of PhD student's thesis work and it will give training to the PhD student. |
| URL | https://topcat.isis.stfc.ac.uk/doi/INVESTIGATION/124325582/ |
| Title | Novel ground state in the frustrated S=1 tetramer antiferromagnet K2Ni2(MoO4)3 |
| Description | Quantum materials wherein frustration, the topology of the electronic band structure, spin correlations, and subtle interplay between emergent degrees of freedom are at play can host a panoply of novel quantum states spanning from spin liquids to Bose-Einstein Condensation with exotic fractionalized excitations. Herein, we focus on a new frustrated antiferromagnet K2Ni2(MoO4)3 in which Ni2+ ions constitute a tetramer. The magnetic susceptibility and specific heat on the single crystal and polycrystal exhibit short-range spin correlations without a gap in the spin excitation spectrum. The presence of a sharp peak at around ~ 1.1 K in magnetization and specific results suggest the presence of long range magnetic order. Remarkably, the external magnetic field induces magnetic phenomena akin to the BEC of triplon excitations in spin gap magnets. T-H phase boundary follows a power law (T-T_N)?H^(2/3) as predicted for the BEC scenario. Our thermodynamic results suggest the titled material is located in the proximity of a quantum critical point (QCP), which separates the magnetically ordered and spin-gap regions of the phase diagram. We propose a µSR study much below the sub-Kelvin temperatures to unambiguously confirm the BEC state, extract the relevant order parameter, and critical exponents essential to establish universality class in BEC of magnetic excitations in this novel frustrated antiferromagnet. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | This is the beam time proposal and it will boost the high impact publications of ISIS Facility. |
| URL | https://topcat.isis.stfc.ac.uk/doi/STUDY/124325595/ |
| Title | Possible spin-liquid state in the rare-earth based kagome antiferromagnet |
| Description | The interplay between spin-orbit coupling, spin correlation, and crystal electric field in rare-earth-based geometrically frustrated magnets offers a promising ground for the search for enigmatic quantum spin liquids (QSL). QSL is a highly entangled state ideal to host fractional excitations coupled to emergent gauge fields and has immense potential for braiding quantum computing technology. However, the experimental realization of QSL is a challenging theme due to the presence of defect and disorder in real quantum materials. Here, we focus on a new rare-earth-based spin-lattice Pr3BWO9 wherein Pr3+ ions constitute a two-dimensional corner shared triangles decorating a kagome quantum magnet. Neither magnetic susceptibility nor specific-heat data show any signature of long-range magnetic ordering or spin freezing down to 70 mK despite a sizable Curie-Weiss temperature of ?cw = - 6.8 K. This calls for more sensitive local-probe magnetic investigations that could unambiguously confirm the spin-liquid ground state and characterize the corresponding magnetic excitations at very low temperature given the rather weak exchange coupling between Pr3+ moments. We propose a µSR study at sub-kelvin temperatures to provide valuable insight and confirm the spin-liquid conjecture in this novel rare-earth-based kagome lattice antiferromagnet family and to explore the role of rare-earth ions on the quantum-disordered state. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | ISIS facility beam time proposal and impact is on the high quality output from the ISIS instruments. |
| URL | https://topcat.isis.stfc.ac.uk/doi/STUDY/124328251/ |
| Title | Possible spin-liquid state in the rare-earth based kagome antiferromagnet |
| Description | The interplay between spin-orbit coupling, spin correlation, and crystal electric field in rare-earth-based geometrically frustrated magnets offers a promising ground for the search for enigmatic quantum spin liquids (QSL). QSL is a highly entangled state ideal to host fractional excitations coupled to emergent gauge fields and has immense potential for braiding quantum computing technology. However, the experimental realization of QSL is a challenging theme due to the presence of defect and disorder in real quantum materials. Here, we focus on a new rare-earth-based spin-lattice Pr3BWO9 wherein Pr3+ ions constitute a two-dimensional corner shared triangles decorating a kagome quantum magnet. Neither magnetic susceptibility nor specific-heat data show any signature of long-range magnetic ordering or spin freezing down to 70 mK despite a sizable Curie-Weiss temperature of ?cw = - 6.8 K. This calls for more sensitive local-probe magnetic investigations that could unambiguously confirm the spin-liquid ground state and characterize the corresponding magnetic excitations at very low temperature given the rather weak exchange coupling between Pr3+ moments. We propose a µSR study at sub-kelvin temperatures to provide valuable insight and confirm the spin-liquid conjecture in this novel rare-earth-based kagome lattice antiferromagnet family and to explore the role of rare-earth ions on the quantum-disordered state. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | This is a beam time proposal for muon spin rotation study at ISIS facility on quantum spin liquid materials, which are the main topic of our EPSRFC funding grant. The work will be published in a high impact journal. The impact will be on our understanding of the role of geometrical magnetic frustration in the quantum spin liquid ground state in kagome lattices. |
| URL | https://topcat.isis.stfc.ac.uk/doi/INVESTIGATION/124328239/ |
| Title | Probing the ground state magnetic structure of single crystalline Mn2V2O7 |
| Description | Mn2V2O7 exhibits reversible structural transition from the high temperature monoclinic phase (C2/m) to low temperature triclinic phase (P-1) near room temperature where Mn2+ ions form regular and distorted honeycomb network respectively. An antiferromagnetic like transition below 20 K as well as magnetic anisotropy were observed in this compound. We performed powder neutron diffraction measurement and this data fitted well with commensurate propagation vector (0,0.5,0) between 12 K and TN =20 K and Mn2+ shows the antiferromagnetic allignment. But below 12 K the magnetic structure is still to be explored where splitting of magnetic peaks indicates incommensurate structure and it is nontrivial to determine based on powder data. Hence, we propose here to carry out single crystal neutron diffraction study on Mn2V2O7 which is important to explicitly solve the ground state magnetic structure. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2018 |
| Provided To Others? | Yes |
| Impact | Impact is on fundamental physics of transition metal based honeycomb materials, which are important class of materials to test theoretical predictions |
| URL | https://data.isis.stfc.ac.uk/doi/STUDY/103195010/ |
| Title | Single crystal study of the magnetic structure of a Pr-based antiferromagnet with competing interactions |
| Description | Rare-earth based correlated materials often host competing interactions and electronic ground states associated with different degrees of freedom. We have examined a Pr-based antiferromagnet, which we find has an unusual magnetic phase diagram as a function of pressure and applied magnetic fields, exhibiting an intricate interplay of different magnetic and electronic states. We previously performed powder neutron diffraction measurements using the WISH diffractometer, which revealed antiferromagnetic Bragg peaks below the magnetic transition, as well as diffuse magnetic scattering. In order to unambiguously determine the complex magnetic structure, and to probe the nature of the diffuse scattering, here we propose a follow-up experiment to measure the low temperature single crystal neutron diffraction using WISH. Knowledge of the nature of both the long range and short range magnetic ordering will allow us to gain a microscopic understanding of the magnetism, and is important for modelling the magnetic phase diagram and revealing the mechanisms behind the unusual interplay of different phases. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | This is the research proposal submitted to ISIS. The impact is on the ISIS science output and training to PhD student. |
| URL | https://topcat.isis.stfc.ac.uk/doi/INVESTIGATION/124327439/ |
| Title | Single crystal study of the magnetic structure of a Pr-based antiferromagnet with competing interactions |
| Description | Rare-earth based correlated materials often host competing interactions and electronic ground states associated with different degrees of freedom. We have examined a Pr-based antiferromagnet, which we find has an unusual magnetic phase diagram as a function of pressure and applied magnetic fields, exhibiting an intricate interplay of different magnetic and electronic states. We previously performed powder neutron diffraction measurements using the WISH diffractometer, which revealed antiferromagnetic Bragg peaks below the magnetic transition, as well as diffuse magnetic scattering. In order to unambiguously determine the complex magnetic structure, and to probe the nature of the diffuse scattering, here we propose a follow-up experiment to measure the low temperature single crystal neutron diffraction using WISH. Knowledge of the nature of both the long range and short range magnetic ordering will allow us to gain a microscopic understanding of the magnetism, and is important for modelling the magnetic phase diagram and revealing the mechanisms behind the unusual interplay of different phases. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| Impact | The impact of this work is on fundamental understanding of the magnetism of rare earth and transition metal based alloys and compounds. |
| URL | https://topcat.isis.stfc.ac.uk/doi/STUDY/124327453/ |
| Title | Strain control of a bandwidth-driven spin reorientation in Ca3Ru2O7 |
| Description | Here, we provide data for the manuscript "Strain control of a bandwidth-driven spin reorientation in Ca3Ru2O7" by C. D. Dashwood, A. H. Walker, M. P. Kwasigroch, L. S. I. Veiga, Q. Faure, J. G. Vale, D. G. Porter, P. Manuel, D. D. Khalyavin, F. Orlandi, C. V. Colin, O. Fabelo, F. Kruger, R. S. Perry, R. D. Johnson, A. G. Green, and D. F. McMorrow. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| Impact | Impact is on fundamental understanding the magnetism of transition metal oxides and role of spin-orbital coupling on the magnetism |
| URL | https://springernature.figshare.com/articles/dataset/Strain_control_of_a_bandwidth-driven_spin_reori... |
| Title | Strain control of a bandwidth-driven spin reorientation in Ca3Ru2O7 |
| Description | Here, we provide data for the manuscript "Strain control of a bandwidth-driven spin reorientation in Ca3Ru2O7" by C. D. Dashwood, A. H. Walker, M. P. Kwasigroch, L. S. I. Veiga, Q. Faure, J. G. Vale, D. G. Porter, P. Manuel, D. D. Khalyavin, F. Orlandi, C. V. Colin, O. Fabelo, F. Kruger, R. S. Perry, R. D. Johnson, A. G. Green, and D. F. McMorrow. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| Impact | This work demonstrate how the magnetism can be controlled using strain. |
| URL | https://springernature.figshare.com/articles/dataset/Strain_control_of_a_bandwidth-driven_spin_reori... |
| Description | Hard X-ray Photoelectron Spectroscopy (HAXPES) and X-ray absorption (XAS) investigations on transition metal oxides |
| Organisation | Max Planck Society |
| Department | Max Planck Institute for Chemical Physics of Solids |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | Our research team prepared the samples in collaboration with Korean group. We performed the bulk characterisation and muon spin rotation measurements. My team was leading the writing the research paper, which has been submitted for publication to Phys. Rev. B. |
| Collaborator Contribution | Dr Takegami Daisuke works in our partner group lead by Prof. Liu Hao Tjeng Director Max Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, 01187, Dresden Germany. Dr Daisuke performed HAXPES measurements on Ba4NbRu3O12 and also carried out DFT calculation. Dr Z. Hu also works in Prof. Liu Hao Tjeng groups and he carried our X-ray absorption study on on Ba4NbRu3O12. |
| Impact | Novel quantum spin liquid ground state in the trimer rhodate Ba4NbRh3O12 Abhisek Bandyopadhyay, S. Lee, D. T. Adroja, G. B. G. Stenning, Adam Berlie, M. R. Lees, R. A. Saha, D. Takegami, A. Melendez-Sans, G. Poelchen, M. Yoshimura, K. D. Tsuei, Z. Hu, Cheng-Wei Kao, Yu-Cheng Huang, Ting-Shan Chan, Kwang-Yong Cho https://arxiv.org/abs/2403.06446 (2024) |
| Start Year | 2023 |
| Description | Muon spin rotation study on Iridates La3Ir3O11 |
| Organisation | Tohoku University |
| Country | Japan |
| Sector | Academic/University |
| PI Contribution | I have started collaboration with Prof. AOYAMA on investigating role of spin-orbital coupling in iridates. He has provided La3Ir3O11 materials and we will submit muon spin rotation and neutron scattering proposals at ISIS Facility, ILL, J-PARC and PSI. His details are given below. Prof. Takuya AOYAMA Department of Physics, Tohoku University 6-3 Aramaki-Aoba, Aobaku, Sendai, Miyagi 980-8578, JAPAN Phone:+81-22-795-6488, Mail:aoyama@tohoku.ac.jp |
| Collaborator Contribution | Provided samples. |
| Impact | At present we are planning for beam time proposals, which will results in future publications. |
| Start Year | 2022 |
| Description | Neutron diffraction study of transition metal oxides |
| Organisation | Institut Laue–Langevin |
| Department | Instutut Laue-Langevin Neutron Scattering Facility (France) |
| Country | France |
| Sector | Academic/University |
| PI Contribution | The projects were started by Prof. Devashi Adroja and Dr Shivani Sharma from ISIS Facility. The papers were written in collaboration with Dr Ritter Clemens. |
| Collaborator Contribution | Dr Ritter Clemens from ILL provided leadership role in performing neutron diffraction experiments at ILL, trained Dr Dr Shivani Sharma on data analysis and involved in writing the research papers. (1) Magnetic structure of the double perovskite La2NiIrO6 investigated using neutron diffraction Shivani Sharma , C. Ritter, D. T. Adroja , G. B. Stenning, A. Sundaresan, and S. Langridge PHYSICAL REVIEW MATERIALS 6, 014407 (2022) (2) Magnetic structures of the iridium-based double perovskites Pr2NiIrO6 and Nd2NiIrO6 reinvestigated using neutron diffraction C. Ritter, S. Sharma, and D. T. Adroja PHYSICAL REVIEW MATERIALS 6, 084405 (2022) |
| Impact | (1) Magnetic structure of the double perovskite La2NiIrO6 investigated using neutron diffraction Shivani Sharma , C. Ritter, D. T. Adroja , G. B. Stenning, A. Sundaresan, and S. Langridge PHYSICAL REVIEW MATERIALS 6, 014407 (2022) (2) Magnetic structures of the iridium-based double perovskites Pr2NiIrO6 and Nd2NiIrO6 reinvestigated using neutron diffraction C. Ritter, S. Sharma, and D. T. Adroja PHYSICAL REVIEW MATERIALS 6, 084405 (2022) |
| Start Year | 2019 |
| Description | Single crystal and polycrystalline synthesis of transition metal oxides |
| Organisation | Max Planck Society |
| Department | Max Planck Institute for Solid State Research |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | Dr Masahiko Isobe from Max Planck Institute for Solid State Research, Heisenberg Strasse 1, D-70569 Stuttgart, Germany and Dr Arvind Yogi from UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore (M.P.) have provided transition metal oxides samples, Ba4NbRu3O12, Ba4TaT3O12 (T=Ir and Ru), ZnCoV2O7, CaCoP2O7 and ZnCoP2O7 for our EPSRC project. We have obtained muon spin rotation and relaxation beam time at FLAME instrument, PSI on ZnCoP2O7 and neutron diffraction at ILL on CaCoP2O7 . Beam time proposals for other materials will be submitted at ISIS Facility, ILL, J-PARC. |
| Collaborator Contribution | Leading muon and neutron proposals at PSI, ILL and ISIS Facility. Experiments will be carried out by our group, data will be analysed and papers will be written. |
| Impact | Beam time allocated at PSI on FLAME instrument to investigate ZnCoP2O7 using muon spin rotation and relaxation. Beam time allocated at ILL on D20 diffractometer to investigate magnetic structure of CaCoP2O7. |
| Start Year | 2023 |
| Description | transport magnetic measurements on transition metal oxides |
| Organisation | University of Warwick |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | I and my team were leading the project on transition metal oxides and performed muon spin rotation and relaxation experiments and analysis of the data. We also performed mK heat capacity and magnetic measurements and analysis of these data. Finally the paper was written by my research team and myself. |
| Collaborator Contribution | Prof. Martin Lees from Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom is performing transport and magnetic measurements on our transition metal oxides based materials. He is also performing SEM-EDX measurements to characterized the composition of the materials. |
| Impact | Novel quantum spin liquid ground state in the trimer rhodate Ba4NbRh3O12 Abhisek Bandyopadhyay, S. Lee, D. T. Adroja, G. B. G. Stenning, Adam Berlie, M. R. Lees, R. A. Saha, D. Takegami, A. Melendez-Sans, G. Poelchen, M. Yoshimura, K. D. Tsuei, Z. Hu, Cheng-Wei Kao, Yu-Cheng Huang, Ting-Shan Chan, Kwang-Yong Cho https://arxiv.org/pdf/2403.06446.pdf |
| Start Year | 2022 |