Pickup, R., Cywinski, R., Pappas, C., Farago, B. and Fouquet, P. (2009) Generalized Spin-Glass Relaxation. Physical Review Letters, 102 (9). 097202. ISSN 0031-9007

Spin relaxation close to the glass temperature of Cu̲ Mn and Au̲ Fe spin glasses is shown, by neutron spin echo, to follow a generalized exponential function which explicitly introduces hierarchically constrained dynamics and macroscopic interactions. The interaction parameter is directly related to the normalized Tsallis nonextensive 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 nonlinear dynamics

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