A perturbation expansion for the free energy of the s-d exchange Hamiltonian

J. Maćkowiak and M. Wiśniewski

Physica A: Statistical Mechanics and its Applications, 1997, vol. 242, issue 3, 482-500

Abstract: The first- and second-order terms of a perturbation expansion of free-energy density of the s-d exchange Hamiltonian with random impurity positions, in the presence and absence of an external magnetic field B, are evaluated. The reduced s-d Hamiltonian Hr(B) is chosen for the Hamiltonian of the unperturbed system. For weak fields B, the expansion takes different forms at temperatures T > Tc and T < Tc, Tc being the temperature at which Hr(B) exhibits a second-order phase transition.

Keywords: s-d exchange; Free energy; Reduced s-d model; Perturbation expansion (search for similar items in EconPapers)
Date: 1997
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:242:y:1997:i:3:p:482-500

DOI: 10.1016/S0378-4371(97)00261-6

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