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Helical order and multiferroicity in the S = 1/2 quasi-kagome system KCu3As2O7(OD)3

hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorNILSEN, G. J.
hal.structure.identifierInstitute for Solid State Physics
dc.contributor.authorOKAMOTO, Y.
hal.structure.identifierInstitute for Solid State Physics
dc.contributor.authorISHIKAWA, H.
hal.structure.identifierMagnétisme et Supraconductivité [NEEL - MagSup]
dc.contributor.authorSIMONET, Virginie
hal.structure.identifierMatériaux, Rayonnements, Structure [NEEL - MRS]
dc.contributor.authorCOLIN, Claire
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCANO, Andres
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorCHAPON, L. C.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorHANSEN, T.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorMUTKA, H.
hal.structure.identifierInstitute for Solid State Physics
dc.contributor.authorHIROI, Z.
dc.date.issued2014
dc.identifier.issn1098-0121
dc.description.abstractEnSeveral Cu2+ hydroxide minerals have been recently identified as candidate realizations of the S=1/2 kagome Heisenberg model. In this context, we have studied the distorted system KCu3As2O7(OD)3 using neutron scattering and bulk measurements. Although the distortion favors magnetic order over a spin liquid ground state, refinement of the magnetic diffraction pattern below TN1=7.05(5) K yields a complex helical structure with k=(0.77,0,0.11). This structure, as well as the spin excitation spectrum, are well described by a classical Heisenberg model with ferromagnetic nearest neighbor couplings. Multiferroicity is observed below TN1, with an unusual crossover between improper and pseudoproper behavior occurring at TN2=5.5 K. The polarization at T=2 K is P=1.5μCm−2. The properties of KCu3As2O7(OD)3 highlight the variety of physics which arise from the interplay of spin and orbital degrees of freedom in Cu2+ kagome systems.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.title.enHelical order and multiferroicity in the S = 1/2 quasi-kagome system KCu3As2O7(OD)3
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.89.140412
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Electrons fortement corrélés [cond-mat.str-el]
dc.identifier.arxiv1404.3107
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.page140412(R)
bordeaux.volume89
bordeaux.issue14
bordeaux.peerReviewedoui
hal.identifierhal-00986108
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00986108v1
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