Sr₂Ir_1−xRh_xO₄(x<0.5): An Inhomogeneous j_eff=1/2 Hubbard system

Authors

Shalinee Chikara, Argonne National Laboratory
Daniel Haskel, Argonne National Laboratory
Jae-Hoon Sim, Korea Advanced Institute of Science and Technology, Korea
Heung-Sik Kim, Korea Advanced Institute of Science and Technology, Korea
Cheng-Chien Chen, Argonne National Laboratory
G. Fabbris, Argonne National Laboratory
L. S. I. Veiga, Argonne National Laboratory
N. M. Souza-Neto, Argonne National Laboratory
Jsaminka Terzic, University of KentuckyFollow
Kamal H. Butrouna, University of KentuckyFollow
Gang Cao, University of KentuckyFollow
Myung Joon Han, Korea Advanced Institute of Science and Technology, Korea
Michael van Veenendaal, Argonne National Laboratory

Abstract

In a combined experimental and theoretical study, we investigate the properties of Sr₂Ir_1−xRh_xO₄. 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 xj_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.

Document Type

Article

Publication Date

8-15-2015

Notes/Citation Information

Published in Physical Review B, v. 92, no. 8, article 081114, p. 1-5.

©2015 American Physical Society

The copyright holders have granted the permission for posting the article here.

Digital Object Identifier (DOI)

http://dx.doi.org/10.1103/PhysRevB.92.081114

Funding Information

Work at Argonne National Laboratory was supported by the US DOE, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. M.v.V. was supported by the US Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-FG02-03ER46097 and NIU’s Institute for Nanoscience, Engineering, and Technology. The computational work was partially performed at NERSC, which is supported by the US DOE Contract No. DE-AC02-05CH11231. Computational resources were partly supported by the National Institute of Supercomputing and Networking/Korea Institute of Science and Technology Information with supercomputing resources including technical support (Grant No. KSC-2013-C2-23). J.H.S. and M.J.H were supported by Basic Science Research Program through NRF (2014R1A1A2057202) and by Samsung Advanced Institute of Technology (SAIT). H.-S.K. was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 2013R1A6A3A01064947). The work at the University of Kentucky was supported by NSF via Grant No. DMR- 1265162.

Repository Citation

Chikara, Shalinee; Haskel, Daniel; Sim, Jae-Hoon; Kim, Heung-Sik; Chen, Cheng-Chien; Fabbris, G.; Veiga, L. S. I.; Souza-Neto, N. M.; Terzic, Jsaminka; Butrouna, Kamal H.; Cao, Gang; Han, Myung Joon; and van Veenendaal, Michael, "Sr₂Ir_1−xRh_xO₄(x<0.5): An Inhomogeneous j_eff=1/2 Hubbard system" (2015). Physics and Astronomy Faculty Publications. 381.
https://uknowledge.uky.edu/physastron_facpub/381