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Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9
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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
American Physical Society , 2016. Vol. 116, no 9, 097205
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-184533DOI: 10.1103/PhysRevLett.116.097205ISI: 000371419600016ScopusID: 2-s2.0-84960893997OAI: oai:DiVA.org:kth-184533DiVA: diva2:917397
Funder
Swedish Research Council, INCA-2014-6426
Note

QC 20160406

Available from: 2016-04-06 Created: 2016-04-01 Last updated: 2016-04-06Bibliographically approved

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Månsson, Martin
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Material Physics, MF
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