Metallic spin-glasses beyond mean-field: An approach to the impurity-concentration dependence of the freezing temperature
| Autor: | Cuervo-Reyes, Eduardo |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 25 (2013) 136006 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/25/13/136006 |
| Popis: | 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. Comment: 4 figures. This is a strongly revised version, where several aspects have been improved, and the equation for the freezing temperature has been refined. It is equivalent to the published version in J. Phys.: Condens. Matter 25 (2013) 136006 |
| Databáze: | arXiv |
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