Donnerer, C;
Sala, MM;
Pascarelli, S;
Rosa, AD;
Andreev, SN;
Mazurenko, VV;
Irifune, T;
... McMorrow, DF; + view all
(2018)
High-pressure insulator-to-metal transition in Sr3Ir2O7 studied by x-ray absorption spectroscopy.
Physical Review B
, 97
(3)
, Article 035106. 10.1103/PhysRevB.97.035106.
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Abstract
High-pressure x-ray absorption spectroscopy was performed at the Ir L3 and L2 absorption edges of Sr3Ir2O7. The branching ratio of white-line intensities continuously decreases with pressure, reflecting a reduction in the angular part of the expectation value of the spin-orbit coupling operator, L · S. Up to the high-pressure structural transition at 53 GPa, this behavior can be explained within a single-ion model, where pressure increases the strength of the cubic crystal field, which suppresses the spin-orbit induced hybridization of Jeff = 3/2 and eg levels. We observe a further reduction of the branching ratio above the structural transition, which cannot be explained within a single-ion model of spin-orbit coupling and cubic crystal fields. This change in L · S in the high-pressure, metallic phase of Sr3Ir2O7 could arise from noncubic crystal fields or a bandwidth-driven hybridization of Jeff = 1/2, 3/2 states and suggests that the electronic ground state significantly deviates from the Jeff = 1/2 limit.
| Type: | Article |
|---|---|
| Title: | High-pressure insulator-to-metal transition in Sr3Ir2O7 studied by x-ray absorption spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.97.035106 |
| Publisher version: | http://doi.org/10.1103/PhysRevB.97.035106 |
| Language: | English |
| Additional information: | © 2018 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, CRYSTAL-STRUCTURE |
| 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/10042052 |
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