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

Katsuyoshi Komatsu, Denis L’Hôte, Sawako Nakamae, Vincent Mosser, Marcin Konczykowski, Emmanuelle Dubois, Vincent Dupuis, and Regine Perzynski
Phys. Rev. Lett. 106, 150603 – Published 14 April 2011

Abstract

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 Teff to the bath temperature T grows from 1 to 6.5 when T is lowered from Tg to 0.3 Tg, 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.

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  • Received 14 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.150603

© 2011 American Physical Society

Authors & Affiliations

Katsuyoshi Komatsu1,*, Denis L’Hôte1,†, Sawako Nakamae1, Vincent Mosser2, Marcin Konczykowski3, Emmanuelle Dubois4, Vincent Dupuis4, and Regine Perzynski4

  • 1Service de Physique de l’Etat Condensé (CNRS/URA 2464), DSM/IRAMIS/SPEC, CEA Saclay, F-91191 Gif/Yvette Cedex, France
  • 2ITRON/Issy Technology Center, 52 rue Camille Desmoulins, F-92130 Issy-les-Moulineaux, France
  • 3Laboratoire des Solides Irradiés, UMR7642 CNRS, Ecole Polytechnique, F-91128 Palaiseau, France
  • 4Laboratoire PECSA, UMR 7195 CNRS, Université Pierre et Marie Curie, 4 place Jussieu, Boîte 51, 75252 Paris Cedex 05, France

  • *katsuyoshi.komatsu@cea.fr
  • denis.lhote@cea.fr

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Issue

Vol. 106, Iss. 15 — 15 April 2011

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