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Re-entrant ferromagnetism in a two-dimensional mixed spin Ising model with random nearest-neighbour interactions

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Zeitschrift für Physik B Condensed Matter

Abstract

Using the finite cluster approximation we study a mixed spin model with random interactions on a ferrimagnetic square lattice (with spins σ=1/2 andS=1). The interactions are assumed to be independent random variables with distribution,P(K ij )=pδ(K ij −K)+(1−p) δ(K ij −αK), whereK>0 and |α|≦1. In a certain range of negative values of α the phase diagrams exhibit re-entrant behaviour. This indicates that re-entrance seems to be a characteristic feature of systems in which both frustration and disorder are present.

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Authors and Affiliations

  1. Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-5000, Köln 41, Federal Republic of Germany

    N. Benayad, A. Klümper & J. Zittartz

  2. Laboratoire de Magnétisme, Faculté des Sciences, B.P. 1014, Rabat, Morocco

    A. Benyoussef

Authors
  1. N. Benayad
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  2. A. Klümper
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  3. J. Zittartz
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  4. A. Benyoussef
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Additional information

On leave from Faculté des Sciences I, Université Hassan II, Casablanca, Morocco; and Laboratoire de Magnétisme Université de Rabat, Morocco

Supported by the agreement of cooperation between the DFG and the CNR-Maroc.

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Benayad, N., Klümper, A., Zittartz, J. et al. Re-entrant ferromagnetism in a two-dimensional mixed spin Ising model with random nearest-neighbour interactions. Z. Physik B - Condensed Matter 77, 333–338 (1989). https://doi.org/10.1007/BF01313678

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  • DOI: https://doi.org/10.1007/BF01313678

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