Generalized Spin Glass Relaxation

Details Generalized Spin Glass Relaxation Generalized Spin Glass Relaxation

2009-02-24

arxiv.org/abs/0902.4183v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages: accepted for publication in Physical Review Letters (Feb 2009)

Scientific paper

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.

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