Quantum magnetism and quantum phase transitions

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"Quasi-particle breakdown" in the quasi-one-dimensional Ising ferromagnet CoNb$_2$O$_6$

(2014)

Authors:

Neil J Robinson, Fabian HL Essler, Ivelisse Cabrera, Radu Coldea
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Cascade of field-induced magnetic transitions in a frustrated antiferromagnetic metal

(2014)

Authors:

AI Coldea, L Seabra, A McCollam, A Carrington, L Malone, AF Bangura, D Vignolles, PG van Rhee, RD McDonald, T Sorgel, M Jansen, N Shannon, R Coldea
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Cascade of field-induced magnetic transitions in a frustrated antiferromagnetic metal

Physical Review B American Physical Society (APS) 90:2 (2014) 020401

Authors:

AI Coldea, L Seabra, A McCollam, A Carrington, L Malone, AF Bangura, D Vignolles, PG van Rhee, RD McDonald, T Sörgel, M Jansen, N Shannon, R Coldea
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Excitations in the quantum paramagnetic phase of the quasi-one-dimensional Ising magnet CoNb2O6 in a transverse field: Geometric frustration and quantum renormalization effects

Physical Review B American Physical Society (APS) 90:1 (2014) 014418

Authors:

I Cabrera, JD Thompson, R Coldea, D Prabhakaran, RI Bewley, T Guidi, JA Rodriguez-Rivera, C Stock
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Realization of a three-dimensional spin-anisotropic harmonic honeycomb iridate.

Nature communications 5 (2014) 4203-4203

Authors:

KA 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, James G Analytis

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.
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