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Spin glass and antiferromagnetism in Kondo-lattice disordered system

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Abstract.

The competition between spin glass (SG), antiferromagnetism (AF) and Kondo effect is studied here in a model which consists of two Kondo sublattices with a Gaussian random interaction between spins in different sublattices with an antiferromagnetic mean J 0 and standard deviation J. In the present approach there is no hopping of the conduction electrons between the sublattices and only spins in different sublattices can interact. The problem is formulated in the path integral formalism where the spin operators are expressed as bilinear combinations of Grassmann fields which can be solved at mean field level within the static approximation and the replica symmetry ansatz. The obtained phase diagram shows the sequence of phases SG, AF and Kondo state for increasing Kondo coupling. This sequence agrees qualitatively with experimental data of the Ce2Au1-x Co x Si3 compound.

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Authors and Affiliations

  1. Departamento de Física - UFSM, 97105-900, Santa Maria, RS, Brazil

    S. G. Magalhães & F. M. Zimmer

  2. Departamento de Matemática, UFSM, 97105-900, Santa Maria, RS, Brazil

    A. A. Schmidt

  3. Instituto de Física, UFRGS, 91501-970, Porto Alegre, RS, Brazil

    A. Theumann

  4. Laboratoire de Physique des Solides, Université Paris-Sud, 91405, Orsay, France

    B. Coqblin

Authors
  1. S. G. Magalhães
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  2. A. A. Schmidt
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  3. F. M. Zimmer
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  4. A. Theumann
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  5. B. Coqblin
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Corresponding author

Correspondence to S. G. Magalhães.

Additional information

Received: 9 April 2003, Published online: 9 September 2003

PACS:

05.50.+q Lattice theory and statistics; Ising problems - 64.60.Cn Order disorder transformations; statistical mechanics of model systems

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Magalhães, S.G., Schmidt, A.A., Zimmer, F.M. et al. Spin glass and antiferromagnetism in Kondo-lattice disordered system. Eur. Phys. J. B 34, 447–453 (2003). https://doi.org/10.1140/epjb/e2003-00243-y

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  • DOI: https://doi.org/10.1140/epjb/e2003-00243-y

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