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

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, Felipe Gandara, Z. Islam, Ashvin Vishwanath, Arkady Shekhter, Ross D. McDonald and James G. Analytis ()
Additional contact information
K. A. Modic: Pulsed Field Facility, Los Alamos National Laboratory
Tess E. Smidt: Lawrence Berkeley National Laboratory
Itamar Kimchi: University of California
Nicholas P. Breznay: Lawrence Berkeley National Laboratory
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
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

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5203

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