Irreversibility Crossover in a Cu:Mn Spin Glass in High Magnetic Fields: Evidence for the Gabay--Toulouse Transition

The longitudinal components of the zero-field-cooled (M sub ZFC ) and field-cooled (M sub FC ) magnetization of dilute Cu:Mn have been measured in magnetic field sbetween 2 G and 30 kG. The difference, Delta M sub irr = M sub FC --M sub ZFC , is taken to be the irreversible magnetization. Above appr...

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Bibliographic Details
Published in:Physical review letters 1991-06, Vol.66 (22), p.2923-2926
Main Authors: Kenning, G G, Chu, D, Orbach, R
Format: Article
Language:English
Online Access:Get full text
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Summary:The longitudinal components of the zero-field-cooled (M sub ZFC ) and field-cooled (M sub FC ) magnetization of dilute Cu:Mn have been measured in magnetic field sbetween 2 G and 30 kG. The difference, Delta M sub irr = M sub FC --M sub ZFC , is taken to be the irreversible magnetization. Above approx 500 G, a weak irreversibility and a strong irreversibility are observed. The onset temperature of the former, or weak irreversibility follows the Gabay--Toulouse H--T relation with a coefficient close to the mean-field value for a Heisenberg system. The onset temperature of the latter is found to agree quantitatively with the mean-field d'Almeida--Thouless-like H--T crossover relation for longitudinal freezing in a Heisenberg system.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.66.2923