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Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9
Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India..
Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India.;Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA..
Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India..
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2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 9, 097205Article in journal (Refereed) PublishedText
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 116, no 9, 097205
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Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-282812DOI: 10.1103/PhysRevLett.116.097205ISI: 000371419600016OAI: oai:DiVA.org:uu-282812DiVA: diva2:919094
Swedish Research Council, INCA-2014-6426
Available from: 2016-04-13 Created: 2016-04-07 Last updated: 2016-04-28Bibliographically approved

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Panda, Swarup K.Mathieu, Roland
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