Relations between the Parisi physical order parameter and ac magnetic susceptibility in spin glasses

The consequences of a hierarchical model for barrier heights between metastable states are explored. We show that the Parisi physical order parameter P(q) extracted from the equilibrium out-of-phase susceptibility, is consistent with previous de measurement of P(q). The dynamic susceptibility χ″(ω,...

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Bibliographic Details
Published in:Philosophical magazine. B, Physics of condensed matter. Structural, electronic, optical, and magnetic properties. Physics of condensed matter. Structural, electronic, optical, and magnetic properties., 1998-02, Vol.77 (2), p.221-229
Main Authors: Joh, Y. G., Orbach, R.
Format: Article
Language:English
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Summary:The consequences of a hierarchical model for barrier heights between metastable states are explored. We show that the Parisi physical order parameter P(q) extracted from the equilibrium out-of-phase susceptibility, is consistent with previous de measurement of P(q). The dynamic susceptibility χ″(ω, t) before and after a dc magnetic field change is obtained by introducing a reduction of barrier heights by the relative Zeeman energy change E z , the reduction increasing for increasing barrier height. This results in the correct frequency dependence for the observed jump in χ″(ω) upon a change in magnetic field. Measurement of these jumps over a wide range of waiting times serves as a vehicle for the determination of excitation barrier response to a magnetic field change.
ISSN:1364-2812
1463-6417
DOI:10.1080/13642819808204947