Non-linear susceptibilities and spin-glass transition in CuMn

Magnetic, thermal, and electric properties of alloys of the systems FeNi, NiCr, FeNi‐Mn, and FeNi‐Cr are studied. Itis shown that in alloys of the systems FeNi and NiCr, spin glass does not appear. The form of phase diagrams of the quasi‐binary systems Mn20FexNi80 − xFe50Ni5o −xMnx, Fe65Ni35 −xCrx, and Cr10FexNi90 −x is determined. The diagrams are compared with the character of variation of susceptibility, heat capacity, and magnetoresistance at a concentration magnetic transition. The investigationof the behaviour of nonlinear susceptibility of FeNiCr(Mn) spin glasses in the vicinity of the ‘freezing’ point, Tf, provides evidence for the presence of a phase transition. The variation in the properties at the double temperature transition, paramagnetism‐ferromagnetism‐spin glass is considered.

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Concentration magnetic transitions in alloys with mixed exchange interaction

Deryabin

T'kov

Kazantsev

et al. 1986

phys. stat. sol. (a)

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The Generalized Curie‐Weiss Law

Fähnle

Souletie²

1986

Physica Status Solidi (b)

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It is shown that the zero-field suscetpibility x of many ferromagnets may be described with high accuracy by a modified power law (generalized Curie-Weiss law) xT -[ ( T -Tc)/T]-vc in the whole paramagnetic regime, where yc is the critical susceptibility exponent. In contrast, the conventional power law z T c -[ ( T -Tc)/Tc]-vc holds only for the very small critical regime. Application of the scaling variable (T -T c ) / T , which is non-linear in T , to other physical situations (spin glasses, percolation) is discussed. Altogether the temperature range where scaling ideas ere useful appears to be much wider than generally expected. Es wird gezeigt, daR die The Generalized Curie-Weiss LawSuppose an experimentalist investigating the paramagnetic zero-field susceptibility x ( T ) of a ferromagnet near the Curie temperature T c is asking: "How can I determine the extension of the critical regime ?" The conventional answer is: "The critical regime is the one for which the susceptibility data may be represented t o a certain accuracy bywhere yc is the asymptotic critical exponent". To test for the validity of (l), Kouvel and Fisher [l]

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A mean field spin glass with short-range interactions

et al. 1986

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Abstract. We formulate and study a spin glass model on the Bethe lattice. Appropriate boundary fields replace the traditional self-consistent methods; they give our model well-defined thermodynamic properties. We establish that there is a spin glass transition temperature above which the single-site magnetizations vanish, and below which the Edwards-Anderson order parameter is strictly positive. In a neighborhood below the transition temperature, we use bifurcation theory to establish the existence of a nontrivial distribution of single-site magnetizations. Two properties of this distribution are studied: the leading perturbative correction to the Gaussian scaling form at the transition, and the (nonperturbative) behavior of the tails.

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Non-linear susceptibilities and spin-glass transition in CuMn

Cited by 5 publications

References 11 publications

Concentration magnetic transitions in alloys with mixed exchange interaction

Concentration magnetic transitions in alloys with mixed exchange interaction

The Generalized Curie‐Weiss Law

A mean field spin glass with short-range interactions

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