Satisfaction and Violation of the Fluctuation-Dissipation Relation in Spin Ice Materials
We test the fluctuation-dissipation relation (FDR) in spin ice materials Dy_{2}Ti_{2}O_{7} and Ho_{2}Ti_{2}O_{7} by measuring both the magnetic noise and the out-of-phase part of the susceptibility and comparing their ratio. We show that it is satisfied at temperatures well into the nonergodic region below 600 mK, indicating local equilibrium. In both materials, below 400 mK, low frequency violations develop, showing an excess of noise as in spin glasses, with a frequency threshold of 0.1 Hz. New relaxation pathways and aging properties are unveiled in this frequency range in the ac susceptibility. The FDR remains valid at higher frequencies down to 150 mK.
Authors
- G. Balakrishnan (ORCID: https://orcid.org/0000-0002-5890-1149)
- S. R. Giblin (ORCID: https://orcid.org/0000-0003-1876-8619)
- P. C. W. Holdsworth (ORCID: https://orcid.org/0000-0003-4062-5067)
- E. Lhotel
- C. Paulsen
- V. Cathelin
- Kazuyuki Matsuhira
- F. Morineau
Institutions
- École Normale Supérieure de Lyon (FR)
- Kyushu Institute of Technology (JP)
- University of Warwick (GB)
- Institut Néel (FR)
- Institut des langues et cultures d'Europe, Amérique, Afrique, Asie et Australie (FR)
- Cardiff University (GB)
- Université Grenoble Alpes (FR)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-04
- DOI
- https://doi.org/10.1103/physrevlett.134.096702
- Citations
- 7
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 8.81
Funders
- Agence Nationale de la Recherche
- University of Tokyo
- Engineering and Physical Sciences Research Council