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High-pressure insulator-to-metal transition in Sr3Ir2O7 studied by x-ray absorption spectroscopy

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. Green open access

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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 > Provost and Vice Provost Offices
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: http://discovery.ucl.ac.uk/id/eprint/10042052
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