Experimental realizations of mean-field Ising and Heisenberg spin-glasses

In the Ising mean-field model of a spin-glass it is predicted that the onset of strong irreversibility and the susceptibility cusp coincide and that the critical exponent of the order parameter is unity. Both of these behaviors have been observed in our measurements on the alloy Fe 65Mn 21Cr 14, nea...

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Bibliographic Details
Published in:Solid state communications 1985-01, Vol.56 (6), p.523-526
Main Authors: Datta, T., Thornberry, D., Almasan, C., Jones, E.R.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Materials science
Metals, semimetals and alloys
Other topics in magnetic properties and materials
Physics
Saturation moments and magnetic susceptibilities
Specific materials
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Summary:In the Ising mean-field model of a spin-glass it is predicted that the onset of strong irreversibility and the susceptibility cusp coincide and that the critical exponent of the order parameter is unity. Both of these behaviors have been observed in our measurements on the alloy Fe 65Mn 21Cr 14, near 280 K. In contrast, recently published measurements on Fe 69Mn 26Cr 5 exibited two distinct changes of magnetic behavior below the transition temperature as predicted in the Heisenberg mean-field model. In view of these observations, we believe that these two materials represent the extreme cases of mean-field theory.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(85)90707-0