From linear to nonlinear response in spin glasses: Importance of mean-field-theory predictions

Article

关键词: REPLICA SYMMETRY-BREAKING;    WEAK ERGODICITY BREAKING;    MAGNETIC-FIELD;    NONEQUILIBRIUM DYNAMICS;    REMANENT MAGNETIZATION;    OFF-EQUILIBRIUM;    PHASE;    BEHAVIOR;    SYSTEMS;    TRANSITION;   

DOI  :  10.1103/PhysRevB.66.014412

来源: SCIE

【 摘 要 】

Departures from spin-glass linear response in a single-crystal Cu:Mn (1.5 at. %) are studied for a wide range of changes in magnetic field DeltaH. Three quantities, the difference TRM-(MFC-ZFC), the effective waiting time t(w)(eff), and the difference TRM(t(w))-TRM(t(w)=0), are examined in our analysis. Three regimes of spin-glass behavior are observed as DeltaH increases. Lines in the (T,DeltaH) plane, corresponding to weak and strong violations of linear response under a change in magnetic field, are shown to have the same functional form as the de-Almeida-Thouless critical line. It is suggested that the mean-field description of spin-glass dynamics, with two additional experimentally justified assumptions, predicts H/H-AT scaling for remanent magnetization curves. This scaling is shown to hold with high precision. Our experimental results support predictions of the mean-field theory of aging phenomena.

【 授权许可】

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