Extraction of the spin glass correlation length

被引：104

作者：

Joh, YG ^{[1
]}

Orbach, R

Wood, GG

Hammann, J

Vincent, E

机构：

[1] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[2] CEA Saclay, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.82.438

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The peak of the spin glass relaxation rate, S(t) = d[-M-TRM(t,t(w))/H]/d ln t, is directly related to the typical value of the free energy barrier which can he explored over experimental time scales. A change in magnetic field H generates an energy E-z = N(s)chi(fc)H(2) by which the barrier heights are reduced, where chi(fc) is the field cooled susceptibility per spin, and N-s is the number of correlated spins. The shift of the peak of S(t) gives E-z generating the correlation length, xi(t, T) for Cu:Mn at.% and CdCr1.7In0.3S4. Fits to power law dynamics, xi(t, T) infinity t(a(T)) and activated dynamics xi(t, T) infinity (In t)(1/psi) compare well with simulation fits but possess too small a prefactor for activated dynamics.

引用

页码：438 / 441

页数：4

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