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Title: Sr 2 Ir 1 x Rh x O 4 ( x < 0.5 ) : An inhomogeneous j eff = 1 2 Hubbard system

Abstract

In a combined experimental and theoretical study, we investigate the properties of Sr 2Ir 1-xRh xO 4. 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 j eff = 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:
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
OSTI Identifier:
1393967
Alternate Identifier(s):
OSTI ID: 1212491
Grant/Contract Number:  
AC02-06CH11357; FG02-03ER46097; AC02-05CH11231
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chikara, Shalinee, Haskel, Daniel, Sim, Jae -Hoon, Kim, Heung -Sik, Chen, Cheng -Chien, Fabbris, G., Veiga, L. S. I., Souza-Neto, N. M., Terzic, J., Butrouna, K., Cao, G., Han, Myung Joon, and van Veenendaal, Michel. Sr2Ir1–xRhxO4(x<0.5) : An inhomogeneous jeff=12 Hubbard system. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.081114.
Chikara, Shalinee, Haskel, Daniel, Sim, Jae -Hoon, Kim, Heung -Sik, Chen, Cheng -Chien, Fabbris, G., Veiga, L. S. I., Souza-Neto, N. M., Terzic, J., Butrouna, K., Cao, G., Han, Myung Joon, & van Veenendaal, Michel. Sr2Ir1–xRhxO4(x<0.5) : An inhomogeneous jeff=12 Hubbard system. United States. doi:10.1103/PhysRevB.92.081114.
Chikara, Shalinee, Haskel, Daniel, Sim, Jae -Hoon, Kim, Heung -Sik, Chen, Cheng -Chien, Fabbris, G., Veiga, L. S. I., Souza-Neto, N. M., Terzic, J., Butrouna, K., Cao, G., Han, Myung Joon, and van Veenendaal, Michel. Sat . "Sr2Ir1–xRhxO4(x<0.5) : An inhomogeneous jeff=12 Hubbard system". United States. doi:10.1103/PhysRevB.92.081114. https://www.osti.gov/servlets/purl/1393967.
@article{osti_1393967,
title = {Sr2Ir1–xRhxO4(x<0.5) : An inhomogeneous jeff=12 Hubbard system},
author = {Chikara, Shalinee and Haskel, Daniel and Sim, Jae -Hoon and Kim, Heung -Sik and Chen, Cheng -Chien and Fabbris, G. and Veiga, L. S. I. and Souza-Neto, N. M. and Terzic, J. and Butrouna, K. and Cao, G. and Han, Myung Joon and van Veenendaal, Michel},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.081114},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 8,
volume = 92,
place = {United States},
year = {2015},
month = {8}
}

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Works referenced in this record:

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Strong Spin-Orbit Coupling Effects on the Fermi Surface of Sr 2 RuO 4 and Sr 2 RhO 4
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Spin-orbit tuned metal-insulator transitions in single-crystal Sr 2 Ir 1 x Rh x O 4 ( 0 x 1 )
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Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4
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Novel J eff = 1 / 2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr 2 IrO 4
journal, August 2008


Reduced Effective Spin-Orbital Degeneracy and Spin-Orbital Ordering in Paramagnetic Transition-Metal Oxides: Sr 2 IrO 4 versus Sr 2 RhO 4
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Dilute magnetism and spin-orbital percolation effects in Sr 2 Ir 1 x Rh x O 4
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Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr 2 IrO 4
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Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
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Insulator-metal transition driven by change of doping and spin-orbit interaction in Sr 2 IrO 4
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Inhomogeneous Metallic Phase in a Disordered Mott Insulator in Two Dimensions
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