arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0926cond-mat.dis-nncond-mat.mtrl-scicond-mat.stat-mech
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平均场之外的金属自旋玻璃:凝固温度与杂质浓度关系的探讨

Metallic spin-glasses beyond mean-field: An approach to the impurity-concentration dependence of the freezing temperature

Eduardo Cuervo-Reyes

摘要:

在考虑自旋关联($G^{}_{ij}$)的情况下,导出了金属自旋玻璃中凝固温度($T^{}_{\rm g}$)与交换耦合($J^{}_{ij}$)之间的关系。这种方法不涉及无序平均。将$J^{}_{ij}/T^{}_{\rm g}$中的关联展开到一阶,得到Thouless-Anderson-Palmer的分子场结果。利用无序金属中自旋相互作用的现有理论,得到了$T^{}_{\rm g}$与杂质浓度的关系式,该方程很好地再现了{ \sl Au}Fe,{ \sl Ag}Mn和{ \sl Cu}Mn合金的数据.

英文摘要:

A relation between the freezing temperature ($T^{}_{\rm g}$) and the exchange couplings ($J^{}_{ij}$) in metallic spin-glasses is derived, taking the spin-correlations ($G^{}_{ij}$) into account. This approach does not involve a disorder-average. The expansion of the correlations to first order in $J^{}_{ij}/T^{}_{\rm g}$ leads to the molecular-field result from Thouless-Anderson-Palmer. Employing the current theory of the spin-interaction in disordered metals, an equation for $T^{}_{\rm g}$ as a function of the concentration of impurities is obtained, which reproduces the available data from {\sl Au}Fe, {\sl Ag}Mn, and {\sl Cu}Mn alloys well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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