Sala, MM;
Rossi, M;
Boseggia, S;
Akimitsu, J;
Brookes, NB;
Isobe, M;
Minola, M;
... Monaco, G; + view all
(2014)
Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study.
Physical Review B
, 89
(12)
, Article 121101. 10.1103/PhysRevB.89.121101.
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Abstract
The nature of the electronic ground state of Ba2IrO4 has been addressed using soft x-ray absorption and inelastic scattering techniques in the vicinity of the oxygen K edge. From the polarization and angular dependence of x-ray absorption spectroscopy (XAS) we deduce an approximately equal superposition of xy, yz, and zx Ir4+ 5d orbitals. By combining the measured orbital occupancies, with the value of the spin-orbit coupling provided by resonant inelastic x-ray scattering (RIXS), we estimate the crystal field splitting associated with the tetragonal distortion of the IrO6 octahedra to be small, Δ≈50(50) meV. We thus conclude definitively that Ba2IrO4 is a close realization of a spin-orbit Mott insulator with a jeff=1/2 ground state, thereby overcoming ambiguities in this assignment associated with the interpretation of x-ray resonant scattering experiments.
| Type: | Article |
|---|---|
| Title: | Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.89.121101 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevB.89.121101 |
| Language: | English |
| Additional information: | Copyright © 2014 American Physical Society. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1423525 |
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