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Low-temperature relaxation in spin glasses

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Zeitschrift für Physik B Condensed Matter

Abstract

We analyze the mechanism governing the long-time, low-temperature relaxation of the thermoremanent magnetization (σTRM) in metallic spin glasses. Ideas of quantum tunneling and “screening” of the local magnetic moments are employed to explain the existence of a hierarchy of relaxation times. This results in a time decay which is described by anenhanced power law:

$$\sigma _{TRM} = \sigma _0 \exp - A[\ln (\omega t)]^y = \sigma _0 (\omega t)^{ - A[\ln (\omega t)]y - 1} $$

withy≧1. A crossover is predicted below which most parameters become temperature-independent.

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Authors and Affiliations

  1. Sonderforschungsbereich 123, Universität Heidelberg, Im Neuenheimer Feld 294, D-6900, Heidelberg, Germany

    J. L. van Hemmen

  2. Central Research Institute for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525, Budapest 114, Hungary

    A. Sütő

Authors
  1. J. L. van Hemmen
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  2. A. Sütő
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van Hemmen, J.L., Sütő, A. Low-temperature relaxation in spin glasses. Z. Physik B - Condensed Matter 61, 263–266 (1985). https://doi.org/10.1007/BF01317793

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  • DOI: https://doi.org/10.1007/BF01317793

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