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

@article{ ISI:000419230600005,
Author = {Donnerer, C. and Sala, M. Moretti and Pascarelli, S. and Rosa, A. D. and
   Andreev, S. N. and Mazurenko, V. V. and Irifune, T. and Hunter, E. C.
   and Perry, R. S. and McMorrow, D. F.},
Title = {{High-pressure insulator-to-metal transition in Sr3Ir2O7 studied by x-ray
   absorption spectroscopy}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2018}},
Volume = {{97}},
Number = {{3}},
Month = {{JAN 4}},
Abstract = {{High-pressure x-ray absorption spectroscopy was performed at the Ir L-3
   and L-2 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 J(eff) = 3/2 and e(g)
   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 J(eff) =
   1/2, 3/2 states and suggests that the electronic ground state
   significantly deviates from the J(eff) = 1/2 limit.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Donnerer, C (Corresponding Author), UCL, London Ctr Nanotechnol, London WC1E 6BT, England.
   Donnerer, C (Corresponding Author), UCL, Dept Phys & Astron, London WC1E 6BT, England.
   Donnerer, C.; Perry, R. S.; McMorrow, D. F., UCL, London Ctr Nanotechnol, London WC1E 6BT, England.
   Donnerer, C.; Perry, R. S.; McMorrow, D. F., UCL, Dept Phys & Astron, London WC1E 6BT, England.
   Sala, M. Moretti; Pascarelli, S.; Rosa, A. D., ESRF European Synchrotron, 71 Ave Martyrs, F-38000 Grenoble, France.
   Andreev, S. N.; Mazurenko, V. V., Ural Fed Univ, Theoret Phys & Appl Math Dept, Ekaterinburg 620002, Russia.
   Irifune, T., Ehime Univ, Geodynam Res Ctr, 2-5 Bunkyo Cho, Matsuyama, Ehime 7908577, Japan.
   Hunter, E. C., Univ Edinburgh, SUPA, Sch Phys & Astron, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland.
   Hunter, E. C., Univ Edinburgh, Ctr Sci Extreme Condit, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland.
   Hunter, E. C., Univ Oxford, Inorgan Chem Lab, South Parks Rd, Oxford OX1 3QR, England.}},
DOI = {{10.1103/PhysRevB.97.035106}},
Article-Number = {{035106}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
Keywords-Plus = {{CRYSTAL-STRUCTURE}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories  = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
   Condensed Matter}},
ResearcherID-Numbers = {{Mazurenko, Vladimir/P-9241-2017
   Moretti, Marco/AAF-9255-2019
   McMorrow, Desmond/C-2655-2008
   Rosa, Angelika/AAF-9779-2019
   McMorrow, Desmond Francis/M-9036-2019
   }},
ORCID-Numbers = {{Mazurenko, Vladimir/0000-0002-7392-180X
   Moretti, Marco/0000-0002-9744-9976
   McMorrow, Desmond/0000-0002-4947-7788
   McMorrow, Desmond Francis/0000-0002-4947-7788
   Rosa, Angelika/0000-0002-2304-1943
   Giles, Emily/0000-0001-9880-1102
   pascarelli, sakura/0000-0003-4658-3195}},
Funding-Acknowledgement = {{UK Engineering and Physical Sciences Research CouncilEngineering &
   Physical Sciences Research Council (EPSRC) {[}EP/J016713/1,
   EP/N027671/1]; Engineering and Physical Sciences Research
   CouncilEngineering & Physical Sciences Research Council (EPSRC)
   {[}EP/N034694/1, 1342854, EP/N027671/1] Funding Source: researchfish}},
Funding-Text = {{We would like to thank J. Jacobs for the preparation and gas loading of
   the DACs. We acknowledge support from R. Torchio, S. Boccato, and O.
   Mathon. We acknowledge useful discussions with D. Haskel. This work is
   supported by the UK Engineering and Physical Sciences Research Council
   under Grants No. EP/J016713/1 and No. EP/N027671/1.}},
Number-of-Cited-References = {{41}},
Times-Cited = {{8}},
Usage-Count-Last-180-days = {{2}},
Usage-Count-Since-2013 = {{36}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{FR7ES}},
Unique-ID = {{ISI:000419230600005}},
OA = {{Green Published}},
DA = {{2020-12-22}},
}