Universität zu Köln

Terzic, J., Wang, J. C., Ye, Feng ORCID: 0000-0001-7477-4648, Song, W. H., Yuan, S. J., Aswartham, S., DeLong, L. E., Streltsov, S. V., Khomskii, D. I. and Cao, G. (2015). Coexisting charge and magnetic orders in the dimer-chain iridate Ba5AlIr2O11. Phys. Rev. B, 91 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have synthesized and studied single-crystal Ba5AlIr2O11 that features dimer chains of two inequivalent octahedra occupied by tetravalent Ir4+(5d(5)) and pentavalent Ir5+(5d(4)) ions, respectively. Ba5AlIr2O11 is a Mott insulator that undergoes a subtle structural phase transition near T-S = 210 K and a magnetic transition at T-M = 4.5 K; the latter transition is surprisingly resistant to applied magnetic fields mu H-o <= 12 T but more sensitive to modest applied pressure (dT(M)/dp approximate to + 0.61 K/GPa). All results indicate that the phase transition at T-S signals an enhanced charge order that induces electrical dipoles and strong dielectric response near T-S. It is clear that the strong covalency and spin-orbit interaction (SOI) suppress double exchange in Ir dimers and stabilize a novel magnetic state that is neither S = 3/2 nor J = 1/2, but rather lies in an intermediate regime between these two states. The novel behavior of Ba5AlIr2O11 therefore provides unique insights into the physics of SOI along with strong covalency in competition with double-exchange interactions of comparable strength.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Terzic, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, J. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ye, Feng UNSPECIFIED orcid.org/0000-0001-7477-4648 UNSPECIFIED Song, W. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yuan, S. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aswartham, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED DeLong, L. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Streltsov, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cao, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-400818
DOI:	10.1103/PhysRevB.91.235147
Journal or Publication Title:	Phys. Rev. B
Volume:	91
Number:	23
Date:	2015
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 TRANSITION; SR2IRO4 Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/40081