by Sala, M. Moretti, Rossi, M., Boseggia, S., Akimitsu, J. and Brookes, N. B., Isobe, M., Minola, M., Okabe, H., Ronnow, H. M., Simonelli, L., McMorrow, D. F. and Monaco, G.
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, Delta approximate to 50(50) meV. We thus conclude definitively that Ba2IrO4 is a close realization of a spin-orbit Mott insulator with a j(eff) = 1 2 ground state, thereby overcoming ambiguities in this assignment associated with the interpretation of x-ray resonant scattering experiments.
Reference:
Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study (Sala, M. Moretti, Rossi, M., Boseggia, S., Akimitsu, J. and Brookes, N. B., Isobe, M., Minola, M., Okabe, H., Ronnow, H. M., Simonelli, L., McMorrow, D. F. and Monaco, G.), In PHYSICAL REVIEW B, AMER PHYSICAL SOC, volume 89, 2014.
Bibtex Entry:
@article{ ISI:000332449800001,
Author = {Sala, M. Moretti and Rossi, M. and Boseggia, S. and Akimitsu, J. and
Brookes, N. B. and Isobe, M. and Minola, M. and Okabe, H. and Ronnow, H.
M. and Simonelli, L. and McMorrow, D. F. and Monaco, G.},
Title = {{Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4:
A combined oxygen K-edge XAS and RIXS study}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2014}},
Volume = {{89}},
Number = {{12}},
Month = {{MAR 3}},
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, Delta
approximate to 50(50) meV. We thus conclude definitively that Ba2IrO4 is
a close realization of a spin-orbit Mott insulator with a j(eff) = 1 2
ground state, thereby overcoming ambiguities in this assignment
associated with the interpretation of x-ray resonant scattering
experiments.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Sala, MM (Corresponding Author), European Synchrotron Radiat Facil, BP 220, F-38043 Grenoble, France.
Sala, M. Moretti; Rossi, M.; Brookes, N. B.; Simonelli, L.; Monaco, G., European Synchrotron Radiat Facil, F-38043 Grenoble, France.
Boseggia, S.; McMorrow, D. F., UCL, London Ctr Nanotechnol, London WC1E 6BT, England.
Boseggia, S.; McMorrow, D. F., UCL, Dept Phys & Astron, London WC1E 6BT, England.
Boseggia, S., Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England.
Akimitsu, J., Aoyama Gakuin Univ, Dept Phys & Math, Chuo Ku, Sagamihara, Kanagawa 2525258, Japan.
Isobe, M.; Okabe, H., Natl Inst Mat Sci NIMS, Tsukuba, Ibaraki 3050044, Japan.
Minola, M., Politecn Milan, CNISM, CNR SPIN, I-20133 Milan, Italy.
Minola, M., Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy.
Ronnow, H. M., Ecole Polytech Fed Lausanne, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland.
Monaco, G., Univ Trento, Dipartimento Fis, I-38123 Povo, TN, Italy.}},
DOI = {{10.1103/PhysRevB.89.121101}},
Article-Number = {{121101}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
Keywords-Plus = {{ELECTRONIC STATES; SR2IRO4}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
Condensed Matter}},
Author-Email = {{marco.moretti@esrf.fr}},
ResearcherID-Numbers = {{Sala, Marco Moretti/H-1034-2014
Moretti, Marco/AAF-9255-2019
Simonelli, Laura/I-1963-2015
McMorrow, Desmond Francis/M-9036-2019
Monaco, Giulio/AAW-4387-2020
ISOBE, Masaaki/H-2966-2011
Brookes, Nicholas B/C-6718-2019
Ronnow, Henrik M/A-4953-2009
McMorrow, Desmond/C-2655-2008
}},
ORCID-Numbers = {{Sala, Marco Moretti/0000-0002-9744-9976
Moretti, Marco/0000-0002-9744-9976
McMorrow, Desmond Francis/0000-0002-4947-7788
Monaco, Giulio/0000-0003-2497-6422
ISOBE, Masaaki/0000-0002-3201-8489
Brookes, Nicholas B/0000-0002-1342-9530
Ronnow, Henrik M/0000-0002-8832-8865
McMorrow, Desmond/0000-0002-4947-7788
Rossi, Matteo/0000-0002-4254-0713
Minola, Matteo/0000-0003-4084-0664}},
Funding-Acknowledgement = {{Swiss National Science Foundation and its Sinergia network ``Mott
Physics Beyond the Heisenberg Model{''}; EPSRCEngineering & Physical
Sciences Research Council (EPSRC); Engineering and Physical Sciences
Research CouncilEngineering & Physical Sciences Research Council
(EPSRC) {[}EP/J016713/1] Funding Source: researchfish; Grants-in-Aid for
Scientific ResearchMinistry of Education, Culture, Sports, Science and
Technology, Japan (MEXT)Japan Society for the Promotion of
ScienceGrants-in-Aid for Scientific Research (KAKENHI) {[}24740245,
25420723] Funding Source: KAKEN}},
Funding-Text = {{H. M. Ronnow acknowledges support from the Swiss National Science
Foundation and its Sinergia network ``Mott Physics Beyond the Heisenberg
Model.{''} Work in London was supported by EPSRC.}},
Number-of-Cited-References = {{27}},
Times-Cited = {{33}},
Usage-Count-Last-180-days = {{2}},
Usage-Count-Since-2013 = {{68}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{AC3VR}},
Unique-ID = {{ISI:000332449800001}},
OA = {{Green Published}},
DA = {{2020-12-22}},
}
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