Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Chikara, S.; Fabbris, G.; Terzic, J.; Cao, G.; Khomskii, D.; Haskel, D.

doi:10.1103/PhysRevB.95.060407

Title: Charge partitioning and anomalous hole doping in Rh-doped ${Sr}_{2} {IrO}_{4}$

Journal Article · Wed Feb 01 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.060407· OSTI ID:1390814

Chikara, S.; Fabbris, G.; Terzic, J.; Cao, G.; Khomskii, D.; Haskel, D.

The simultaneous presence of sizable spin-orbit interactions and electron correlations in iridium oxides has led to predictions of novel ground states including Dirac semimetals, Kitaev spin liquids, and superconductivity. Electron and hole doping studies of spin-orbit assisted Mott insulator Sr2IrO4 are being intensively pursued due to extensive parallels with the La2CuO4 parent compound of cuprate superconductors. In particular, the mechanism of charge doping associated with replacement of Ir with Rh ions remains controversial with profound consequences for the interpretation of electronic structure and transport data. Using x-ray absorption near edge structure measurements at the Rh L, K, and Ir L edges we observe anomalous evolution of charge partitioning between Rh and Ir with Rh doping. The partitioning of charge between Rh and Ir sites progresses in a way that holes are initially doped into the J(eff) = 1/2 band at low x only to be removed from it at higher x values. This anomalous hole doping naturally explains the reentrant insulating phase in the phase diagram of Sr2Ir1-x Rh-x O-4 and ought to be considered when searching for superconductivity and other emergent phenomena in iridates doped with 4d elements.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Los Alamos National Laboratory (LANL) - Laboratory Directed Research and Development (LDRL)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1390814

Journal Information:: Physical Review B, Vol. 95, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Preferential quenching of 5 d antiferromagnetic order in Sr ₃ (Ir _{1− x} Mn _x ) ₂ O ₇ Schmehr, Julian L.; Zoghlin, Eli; Porter, Zach Journal of Physics: Condensed Matter, Vol. 31, Issue 24 https://doi.org/10.1088/1361-648x/ab0ef9	journal	April 2019
Electronic structure and optical properties of Sr ₂ IrO ₄ under epitaxial strain Bhandari, Churna; Popović, Zoran S.; Satpathy, S. New Journal of Physics, Vol. 21, Issue 1 https://doi.org/10.1088/1367-2630/aaff1b	journal	January 2019
Magnetic excitations in hole-doped ${Sr}_{2} {IrO}_{4}$ : Comparison with electron-doped cuprates Clancy, J. P.; Gretarsson, H.; Upton, M. H. Physical Review B, Vol. 100, Issue 10 https://doi.org/10.1103/physrevb.100.104414	journal	September 2019
Formation of an incoherent metallic state in Rh-doped ${Sr}_{2} {IrO}_{4}$ Louat, A.; Bert, F.; Serrier-Garcia, L. Physical Review B, Vol. 97, Issue 16 https://doi.org/10.1103/physrevb.97.161109	journal	April 2018
Enhanced insulating behavior in the Ir-vacant Sr ₂ Ir _{1– x} O ₄ system dominated by the local structure distortion Cheng, Jie; Dong, Peng; Li, Bin Journal of Synchrotron Radiation, Vol. 25, Issue 4 https://doi.org/10.1107/s1600577518005799	journal	May 2018
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