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Phase Transitions
A Multinational Journal
Volume 77, 2004 - Issue 5-7
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Original Articles

Phase transitions and relaxation characteristics of Quantum Magnets and Quantum Glasses

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Pages 525-561 | Received 30 Nov 2003, Published online: 01 Feb 2007
 

Abstract

An overview is presented of the phase changes as well as certain relaxation characteristics of model quantum magnets, magnetic glasses and proton glasses. Although the systems considered are quite varied, they are connected by the common themes of tunneling, transverse Ising model, long-ranged interactions and above all, the occurrence of quantum phase transitions. Because the interactions are long-ranged, mean-field theory is eminently suitable for analyzing both the equilibrium and nonequilibrium properties. Wherever pertinent, detailed comparisons with experimental data have been presented.

Acknowledgements

V.B. acknowledges the Council of Scientific and Industrial Research of the Government of India for a research grant.

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