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Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9

Nag, Abhishek and Middey, S and Bhowal, Sayantika and Panda, SK and Mathieu, Roland and Orain, JC and Bert, F and Mendels, P and Freeman, PG and Mansson, M and Ronnow, HM and Telling, M and Biswas, PK and Sheptyakov, D and Kaushik, SD and Siruguri, Vasudeva and Meneghini, Carlo and Sarma, DD and Dasgupta, Indra and Ray, Sugata (2016) Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9. In: PHYSICAL REVIEW LETTERS, 116 (9).

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.116.097205

Abstract

We show using detailed magnetic and thermodynamic studies and theoretical calculations that the ground state of Ba3ZnIr2O9 is a realization of a novel spin-orbital liquid state. Our results reveal that Ba3ZnIr2O9 with Ir5+ (5d(4)) ions and strong spin-orbit coupling (SOC) arrives very close to the elusive J = 0 state but each Ir ion still possesses a weak moment. Ab initio density functional calculations indicate that this moment is developed due to superexchange, mediated by a strong intradimer hopping mechanism. While the Ir spins within the structural Ir2O9 dimer are expected to form a spin-orbit singlet state (SOS) with no resultant moment, substantial frustration arising from interdimer exchange interactions induce quantum fluctuations in these possible SOS states favoring a spin-orbital liquid phase down to at least 100 mK.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 07 Apr 2016 05:45
Last Modified: 07 Apr 2016 05:45
URI: http://eprints.iisc.ernet.in/id/eprint/53609

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