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Kitaev exchange and field-induced quantum spin-liquid states in honeycomb α-RuCl3

Scientific reports, 2016-11, Vol.6 (1), p.37925-37925, Article 37925 [Peer Reviewed Journal]

Copyright © 2016, The Author(s) 2016 The Author(s) ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep37925 ;PMID: 27901091

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  • Title:
    Kitaev exchange and field-induced quantum spin-liquid states in honeycomb α-RuCl3
  • Author: Yadav, Ravi ; Bogdanov, Nikolay A. ; Katukuri, Vamshi M. ; Nishimoto, Satoshi ; van den Brink, Jeroen ; Hozoi, Liviu
  • Is Part Of: Scientific reports, 2016-11, Vol.6 (1), p.37925-37925, Article 37925
  • Description: Abstract Large anisotropic exchange in 5 d and 4 d oxides and halides open the door to new types of magnetic ground states and excitations, inconceivable a decade ago. A prominent case is the Kitaev spin liquid, host of remarkable properties such as protection of quantum information and the emergence of Majorana fermions. Here we discuss the promise for spin-liquid behavior in the 4 d 5 honeycomb halide α -RuCl 3 . From advanced electronic-structure calculations, we find that the Kitaev interaction is ferromagnetic, as in 5 d 5 iridium honeycomb oxides, and indeed defines the largest superexchange energy scale. A ferromagnetic Kitaev coupling is also supported by a detailed analysis of the field-dependent magnetization. Using exact diagonalization and density-matrix renormalization group techniques for extended Kitaev-Heisenberg spin Hamiltonians, we find indications for a transition from zigzag order to a gapped spin liquid when applying magnetic field. Our results offer a unified picture on recent magnetic and spectroscopic measurements on this material and open new perspectives on the prospect of realizing quantum spin liquids in d 5 halides and oxides in general.
  • Publisher: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep37925
    PMID: 27901091
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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