Long-range order versus random-singlet phases in quantum antiferromagnetic systems with quenched disorder

Abstract

The stability of antiferromagnetic long-range order against quenched disorder is considered. A simple model of an antiferromagnet with a spatially varying Neel temperature is shown to possess a nontrivial fixed point corresponding to long-range order that is stable unless either the order parameter or the spatial dimensionality exceeds a critical value. The instability of this fixed point corresponds to the system entering a random-singlet phase. The stabilization of long-range order is due to quantum fluctuations, whose role in determining the phase diagram is discussed.

5 pp., REVTeX, epsf, 3 eps figs, final version as published, including erratum

References in corpus (2)

• Crossover and scaling in a nearly antiferromagnetic Fermi liquid in two dimensions
• Anderson-Mott transition as a quantum glass problem

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