Experimental Evidence for Violation of the Fluctuation-Dissipation Theorem in a Superspin Glass

被引：22

作者：

Komatsu, Katsuyoshi ^{[1
]}

L'Hote, Denis ^{[1
]}

Nakamae, Sawako ^{[1
]}

Mosser, Vincent ^{[2
]}

Konczykowski, Marcin ^{[3
]}

Dubois, Emmanuelle ^{[4
]}

Dupuis, Vincent ^{[4
]}

Perzynski, Regine ^{[4
]}

机构：

[1] CEA Saclay, CNRS, SPEC, IRAMIS,DSM,Serv Phys Etat Condense,URA 2464, F-91191 Gif Sur Yvette, France

[2] Issy Technol Ctr, ITRON, F-92130 Issy Les Moulineaux, France

[3] Ecole Polytech, CNRS, Lab Solides Irradies, UMR7642, F-91128 Palaiseau, France

[4] Univ Paris 06, CNRS, Lab PECSA, UMR 7195, F-75252 Paris 05, France

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 15期

关键词：

SPIN-GLASS; MONTE-CARLO; EQUILIBRIUM; DYNAMICS; RELAXATION; SYSTEMS; GROWTH; NOISE;

D O I：

10.1103/PhysRevLett.106.150603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the experimental observation of the fluctuation-dissipation theorem violation in an assembly of interacting magnetic nanoparticles in the low temperature superspin-glass phase. The magnetic noise is measured with a two-dimension electron gas Hall probe and compared to the out of phase ac susceptibility of the same ferrofluid. For "intermediate'' aging times of the order of 1 h, the ratio of the effective temperature T-eff to the bath temperature T grows from 1 to 6.5 when T is lowered from T-g to 0.3 T-g, regardless of the noise frequency. These values are comparable to those measured in an atomic spin glass as well as those calculated for a Heisenberg spin glass.

引用

页数：4

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