Universität zu Köln

Chikara, S., Fabbris, G., Terzic, J., Cao, G., Khomskii, D. and Haskel, D. (2017). Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4. Phys. Rev. B, 95 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chikara, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fabbris, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Terzic, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cao, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haskel, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-239722
DOI:	10.1103/PhysRevB.95.060407
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	6
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITIONS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23972