Satisfaction and Violation of the Fluctuation-Dissipation Relation in Spin Ice Materials

被引：0
|
作者：
Morineau, F. [1 ]
Cathelin, V. [1 ]
Holdsworth, P. C. W. [2 ]
Giblin, S. R. [3 ]
Balakhrishnan, G. [4 ]
Matsuhira, K. [5 ]
Paulsen, C. [1 ]
Lhotel, E. [1 ]
机构：
[1] Univ Grenoble Alpes, Inst Neel, CNRS, F-38042 Grenoble, France
[2] ENS Lyon, CNRS, Lab Phys, F-69342 Lyon, France
[3] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, England
[4] Univ Warwick, Dept Phys, Coventry CV4 7AL, England
[5] Kyushu Inst Technol, Kitakyushu 8048550, Japan
来源：
PHYSICAL REVIEW LETTERS | 2025年 / 134卷 / 09期
基金：
英国工程与自然科学研究理事会;
关键词：
MAGNETIC MONOPOLES; DYNAMICS; GLASSES; NOISE;
D O I：
10.1103/PhysRevLett.134.096702
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We test the fluctuation-dissipation relation (FDR) in spin ice materials Dy2Ti2O7 and Ho2Ti2O7 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.
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页数：6
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