Quantum magnets and glasses

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Abstract
We explore the behaviour of the dipolar-coupled Ising magnet, , in a transverse magnetic field. The transverse field, applied perpendicular to the Ising axis, introduces quantum channels for relaxation, thereby continuously depressing the spin-ordering temperature to zero. We compare the classical (thermally driven) and the quantum (transverse-field-driven) transitions for both the pure ferromagnet, , and the spin glass, , and we discuss the implications of these results for the T = 0 disordered ferromagnet (x = 0.5). Finally, we contrast these high-resolution studies of model quantum transitions in insulating magnets with the quantum critical behaviour of the highly correlated Mott - Hubbard metals and .