Generalized Spin Glass Relaxation

• Main Authors: Pickup, R M, Cywinski, R, Pappas, C, Farago, B, Fouquet, P
• Format: Journal Article
• Language: English
• Published: 24-02-2009
• Subjects: Physics - Disordered Systems and Neural Networks; Physics - Other Condensed Matter
• DOI: 10.48550/arxiv.0902.4183

Spin relaxation close to the glass temperature of CuMn and AuFe spin glasses
is shown, by neutron spin echo, to follow a generalised exponential function
which explicitly introduces hierarchically constrained dynamics and macroscopic
interactions. The interaction parameter is directly related to the normalised
Tsallis non-extensive entropy parameter, q, and exhibits universal scaling with
reduced temperature. At the glass temperature q=5/3 corresponding, within
Tsallis' q-statistics, to a mathematically defined critical value for the onset
of strong disorder and non-linear dynamics.