Abstract:
The Kondo lattice model has been analyzed in the presence of a random inter-site interaction among localized spins with non zero mean J0 and standard deviation J. Following the same framework previously introduced by us, the problem is formulated in the path integral formalism where the spin operators are expressed as bilinear combinations of Grassmann fields. The static approximation and the replica symmetry ansatz have allowed us to solve the problem at a mean field level. The resulting phase diagram displays several phase transitions among a ferromagnetically ordered region,a spin glass one, a mixed phase and a Kondo state depending on J0, J and its relation with the Kondo interaction coupling JK. These results could be used to address part of the experimental data for the CeNi 1 - x Cu x compound, when x ⩽ 0.8.
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Received 24 June 2002 Published online 31 December 2002
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Magalh aes , S., Schmidt, A., Theumann, A. et al. Spin glass and ferromagnetism in Kondo lattice compounds. Eur. Phys. J. B 30, 419–425 (2002). https://doi.org/10.1140/epjb/e2002-00398-y
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DOI: https://doi.org/10.1140/epjb/e2002-00398-y