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arXiv 0902.4183cond-mat.dis-nncond-mat.other
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广义自旋玻璃弛豫

Generalized Spin Glass Relaxation

R M Pickup, R Cywinski, C Pappas, B Farago, P Fouquet

摘要:

自旋弛豫接近CuMn和AuFe自旋玻璃的玻璃温度示出,中子自旋回波,遵循广义指数函数,明确介绍了层次约束动力学和宏观相互作用。的相互作用参数是直接相关的归一化Tsallis非广延熵参数,q,并表现出普遍的缩放与降低温度。在玻璃化温度q=5/3时,对应于Tsallis的q统计中的数学定义的临界值,用于强无序和非线性动力学的开始。

英文摘要:

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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