Emergence of novel electronic states in 5d transition metal oxides
Lead Research Organisation:
University of Oxford
Department Name: Oxford Physics
Abstract
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Publications
Moretti Sala M
(2015)
Evidence of quantum dimer excitations in Sr 3 Ir 2 O 7
in Physical Review B
Moretti Sala M
(2014)
Crystal field splitting in Sr n + 1 Ir n O 3 n + 1 ( n = 1 , 2 ) iridates probed by x-ray Raman spectroscopy
in Physical Review B
Moreschini L
(2014)
Bilayer splitting and wave functions symmetry in Sr 3 Ir 2 O 7
in Physical Review B
Jacobsen H
(2020)
Erratum: Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate [Phys. Rev. B 101 , 104404 (2020)]
in Physical Review B
Jacobsen H
(2020)
Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate
in Physical Review B
Guo Y
(2014)
Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals A MnBi 2 ( A = Sr , Ca )
in Physical Review B
Donnerer C
(2019)
Selective probing of magnetic order on Tb and Ir sites in stuffed Tb2Ir2O7 using resonant x-ray scattering.
in Journal of physics. Condensed matter : an Institute of Physics journal
Donnerer C
(2016)
All-in-all-Out Magnetic Order and Propagating Spin Waves in Sm_{2}Ir_{2}O_{7}.
in Physical review letters
Dashwood C
(2019)
Momentum-resolved lattice dynamics of parent and electron-doped Sr 2 IrO 4
in Physical Review B
| Description | We investigated the physical properties of several iridium and osmium oxides which exhibit unusual electronic phenomena, and provided definitive answers to a number of key questions: 1. We have established the relevance and robustness of strong spin-orbit coupling in the ground state of iridium in the formation of the Mott insulating phase in several iridium oxide compounds in the series (Sr/Ba)n+1IrnO3n+1. 2. This work has also served to illuminate the unusual bond-directional form of the magnetic interactions in these classes of material arising from the spin and orbitally entangled nature of the ground state. 3. Stability of the spin-orbit Mott insulator has been explored with respect to doping and pressure revealing, among other things, pressure-induced metallisation and the collapse of the Mott gap and emergence of a nodal Fermi liquid in lightly doped Sr2IrO4. 3. We have identified the magnetic structure in a member of the R2Ir2O7 family which is thought to be a realization of a special electronic state known as a Weyl semi-metal. 4. We have provided the first definitive experimental proof of a Slater transition (a metal insulator transition driven by magnetic order) more than 50 years after the original prediction. 5. We have discovered how a ferroelectric-like transition can occur in a metal. 6. We have also found the first example of a metal in which magnetic order causes a loss of a centre of symmetry, i.e. a metallic analogue of a multiferroic material. |
| Exploitation Route | Further experimental and theoretical investigations. |
| Sectors | Other |
| URL | http://xray.physics.ox.ac.uk/Boothroyd/ |
| Description | The findings have been used by other researchers in the field. |
| First Year Of Impact | 2017 |
| Sector | Other |
| Description | A state-of-the-art optical floating-zone furnace for crystal growth at high pressures |
| Amount | £893,916 (GBP) |
| Funding ID | EP/R024278/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 03/2018 |
| End | 09/2020 |
| Description | Standard grant |
| Amount | £488,109 (GBP) |
| Funding ID | EP/N034872/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 11/2016 |
| End | 10/2019 |
| Description | IoP Beijing |
| Organisation | Chinese Academy of Sciences |
| Department | Institute of Physics |
| Country | China |
| Sector | Academic/University |
| PI Contribution | Experimental measurements by neutron and x-ray scattering |
| Collaborator Contribution | Supply of high quality single crystals |
| Impact | A growing list of publications |
| Start Year | 2016 |
| Description | NIMS |
| Organisation | National Institute for Materials Sciences |
| Country | Japan |
| Sector | Academic/University |
| PI Contribution | I have performed neutron and x-ray diffraction measurements to assist the research of partners at NIMS. I shall host a scientist from NIMS as part of an exchange agreement. |
| Collaborator Contribution | Partners at NIMS have provided samples made by specialised high pressure methods. They have also performed characterisation measurements and electronic structure calculations. I was invited to NIMS for one week as part of a visitor programme, |
| Impact | A number of scientific papers have resulted. |
| Start Year | 2013 |
| Description | NIMS |
| Organisation | National Institute for Materials Sciences |
| Country | Japan |
| Sector | Academic/University |
| PI Contribution | I have performed neutron and x-ray diffraction measurements to assist the research of partners at NIMS. I shall host a scientist from NIMS as part of an exchange agreement. |
| Collaborator Contribution | Partners at NIMS have provided samples made by specialised high pressure methods. They have also performed characterisation measurements and electronic structure calculations. I was invited to NIMS for one week as part of a visitor programme, |
| Impact | A number of scientific papers have resulted. |
| Start Year | 2013 |
| Description | UCL-LCN |
| Organisation | University College London |
| Department | London Centre for Nanotechnology |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | My group prepared single crystal samples and performed neutron scattering measurements. |
| Collaborator Contribution | The LCN group under Professor Des McMorrow perfermed synchrotron X-ray scattering experiments on the crystals prepared in Oxford. |
| Impact | Publications |
| Start Year | 2012 |
| Description | Public Lecture entitled: What are Quantum Materials? |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Public/other audiences |
| Results and Impact | This was the inaugural lecture in an annual series run by the Department of Physics at Oxford University. It was an open lecture to which members of the public were invited, and it was filmed and uploaded to YouTube. There were about 110 people in the live audience, and the YouTube video of the lecture has been viewed 1270 times (Feb 2020). |
| Year(s) Of Engagement Activity | 2018 |
| URL | https://www.youtube.com/watch?v=DeumNTFpJro |