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

E Cuervo-Reyes
2013 Journal of Physics: Condensed Matter  
A relation between the freezing temperature (T^_ 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^_ 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^_ g as a function of the concentration of
more » ... es is obtained, which reproduces the available data from AuFe, AgMn, and CuMn alloys well.
doi:10.1088/0953-8984/25/13/136006 pmid:23470842 fatcat:s25xnzskivhqne5itubj7tta2m