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Ferrimagnetic phase transition in the system Li0.5Fe2.52−x GaxO4 in the vicinity of the multicritical point of the x-T phase diagram

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Abstract

In connection with the problem of identifying magnetic states in the vicinity of x 0 (the multicritical point of the x-T diagrams of spin-glass systems) a study has been made of properties that can be exploited to determine the presence of a thermodynamic phase transition at the Curie point T C and the distinctive features of the transition, specifically, the temperature dependence of the magnetic part of the specific heat C m(T), the temperature dependence of the low-field magnetization σ H(T), and (with a view toward examining critical behavior in a magnetic field) the magnetization isotherms σ H(T). The investigated object is the system of dilute ferrimagnetic spinels Li0.5Fe2.5−x GaxO4, in which every type of magnetic state has spatially inhomogeneous cluster structures. The results obtained for a sample with x=1.45 indicate that the classical criteria of a ferrimagnetic second-order phase transition at T C=(97±2) K occur for x∼x 0. The results of similar investigations for a sample with x=1.6, which exists in the cluster spin-glass state for T<T f=22 K and in an uncorrelated cluster state of the superparamagnetic type for T>T f, are also given for comparison with the preceding case.

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Authors and Affiliations

  1. Kharkov State University, 310077, Kharkov, Ukraine

    N. N. Efimova & M. B. Ustimenkova

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  1. N. N. Efimova
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  2. M. B. Ustimenkova
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Zh. Éksp. Teor. Fiz. 114, 2065–2077 (December 1998)

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Efimova, N.N., Ustimenkova, M.B. Ferrimagnetic phase transition in the system Li0.5Fe2.52−x GaxO4 in the vicinity of the multicritical point of the x-T phase diagram. J. Exp. Theor. Phys. 87, 1122–1128 (1998). https://doi.org/10.1134/1.558603

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  • DOI: https://doi.org/10.1134/1.558603

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