A MONTE CARLO STUDY OF THE SPECIFIC HEAT OF DILUTED ANTIFERROMAGNETS

M. Staats () and K. D. Usadel
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M. Staats: Theoretische Physik and SFB 166, Gerhard-Mercator-Universität – Gesamthochschule Duisburg, 47048 Duisburg, Germany
K. D. Usadel: Theoretische Physik and SFB 166, Gerhard-Mercator-Universität – Gesamthochschule Duisburg, 47048 Duisburg, Germany

International Journal of Modern Physics C (IJMPC), 1999, vol. 10, issue 01, 233-239

Abstract: The three-dimensional diluted antiferromagnet in a magnetic field has a longe-range ordered state for sufficiently low temperatures and external fields. We study the irreversibilities at the phase transition from this state into the paramagnetic state at higher temperatures. Performing field cooling and zero field cooling simulation procedures we find a small irreversibility in the internal energy and the specific heat, although the behavior of the order parameter is irreversible and the phase transition is suppressed in the FC case. The specific heat shows a noncritical broad maximum above the transition temperatureTc. The results are compatible with recent experimental results obtained by Satookaet al., whereas our interpretation of the data is different.

Keywords: Critical-point effects; Specific heats; Short-range order; Numerical simulation studies; Spin-glass and other random models (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1142/S0129183199000164

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