by Donnerer, C., Sala, M. Moretti, Pascarelli, S., Rosa, A. D. and Andreev, S. N., Mazurenko, V. V., Irifune, T., Hunter, E. C., Perry, R. S. and McMorrow, D. F.
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.
Reference:
High-pressure insulator-to-metal transition in Sr3Ir2O7 studied by x-ray absorption spectroscopy (Donnerer, C., Sala, M. Moretti, Pascarelli, S., Rosa, A. D. and Andreev, S. N., Mazurenko, V. V., Irifune, T., Hunter, E. C., Perry, R. S. and McMorrow, D. F.), In PHYSICAL REVIEW B, AMER PHYSICAL SOC, volume 97, 2018.
Bibtex Entry:
@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}}, }
Comments are closed