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Title: Sr2Ir1xRhxO4(x<0.5) : An inhomogeneous jeff=12 Hubbard system

In a combined experimental and theoretical study, we investigate the properties of Sr2Ir1-xRhxO4. Here, from the branching ratios of the L-edge isotropic x-ray absorption spectra, we determine that the spin-orbit coupling is remarkably independent of x for both iridium and rhodium sites. DFT + U calculations show that the doping is close to isoelectronic and introduces impurity bands of predominantly rhodium character close to the lower Hubbard band. Overlap of these two bands leads to metallic behavior. Since the low-energy states for x < 0.5 have predominantly jeff = 1/2 character, we suggest that the electronic properties of this material can be described by an inhomogeneous Hubbard model, where the on-site energies change due to local variations in the spin-orbit interaction strength combined with additional changes in binding energy.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [6] ;  [2] ;  [7]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Korea Advanced Institute of Science and Technology, Daejeon (Korea)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Washington Univ., St. Louis, MO (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Lab. Nacional de Luz Sincrotron (LNLS), Sao Paulo (Brazil); Univ. Estadual de Campinas, Sao Paulo (Brazil)
  5. Lab. Nacionnal de Luz Sincrotron (LNLS), Sao Paulo (Brazil)
  6. Univ. of Kentucky, Lexington, KY (United States)
  7. Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02-03ER46097; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 8; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division; Materials Sciences and Engineering Division; National Research Foundation of Korea (NRF); USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1393967
Alternate Identifier(s):
OSTI ID: 1212491