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Realization of a three-dimensional spin–anisotropic harmonic honeycomb iridate

Author

Listed:
  • K. A. Modic

    (Pulsed Field Facility, Los Alamos National Laboratory
    University of Texas)

  • Tess E. Smidt

    (Lawrence Berkeley National Laboratory
    University of California)

  • Itamar Kimchi

    (University of California)

  • Nicholas P. Breznay

    (Lawrence Berkeley National Laboratory
    University of California)

  • Alun Biffin

    (Clarendon Laboratory, University of Oxford)

  • Sungkyun Choi

    (Clarendon Laboratory, University of Oxford)

  • Roger D. Johnson

    (Clarendon Laboratory, University of Oxford)

  • Radu Coldea

    (Clarendon Laboratory, University of Oxford)

  • Pilanda Watkins-Curry

    (The University of Texas at Dallas)

  • Gregory T. McCandless

    (The University of Texas at Dallas)

  • Julia Y. Chan

    (The University of Texas at Dallas)

  • Felipe Gandara

    (Lawrence Berkeley National Laboratory)

  • Z. Islam

    (Advanced Photon Source, Argonne National Laboratory)

  • Ashvin Vishwanath

    (Lawrence Berkeley National Laboratory
    University of California)

  • Arkady Shekhter

    (Pulsed Field Facility, Los Alamos National Laboratory)

  • Ross D. McDonald

    (Pulsed Field Facility, Los Alamos National Laboratory)

  • James G. Analytis

    (Lawrence Berkeley National Laboratory
    University of California)

Abstract

Spin and orbital quantum numbers play a key role in the physics of Mott insulators, but in most systems they are connected only indirectly—via the Pauli exclusion principle and the Coulomb interaction. Iridium-based oxides (iridates) introduce strong spin–orbit coupling directly, such that these numbers become entwined together and the Mott physics attains a strong orbital character. In the layered honeycomb iridates this is thought to generate highly spin–anisotropic magnetic interactions, coupling the spin to a given spatial direction of exchange and leading to strongly frustrated magnetism. Here we report a new iridate structure that has the same local connectivity as the layered honeycomb and exhibits striking evidence for highly spin–anisotropic exchange. The basic structural units of this material suggest that a new family of three-dimensional structures could exist, the ‘harmonic honeycomb’ iridates, of which the present compound is the first example.

Suggested Citation

  • K. A. Modic & Tess E. Smidt & Itamar Kimchi & Nicholas P. Breznay & Alun Biffin & Sungkyun Choi & Roger D. Johnson & Radu Coldea & Pilanda Watkins-Curry & Gregory T. McCandless & Julia Y. Chan & Felip, 2014. "Realization of a three-dimensional spin–anisotropic harmonic honeycomb iridate," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5203
    DOI: 10.1038/ncomms5203
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