Publications associated with Quantum Magnetism and Quantum Phase Transitions

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

Nature communications 5 (2014) 4203-

KA Modic, TE Smidt, I Kimchi, NP Breznay, A Biffin, S Choi, RD Johnson, R Coldea, P Watkins-Curry, GT McCandless, JY Chan, F Gandara, Z Islam, A Vishwanath, A Shekhter, RD McDonald, JG Analytis

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.

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