Stoner exchange parameter

Using this model in analogy with previous studies we can calculate a magnetic moment (fi) of the system with fixed Stoner exchange parameter Id and occupation of the d states. The total energy could then be calculated as the balance between the kinetic energy and the spin-polarization energy ... 

The Stoner exchange parameter was chosen so that the magnetic moment behaved similarly to the magnetic moment for the real Fe-Co alloy. These values were, however,... 

UCo is a paramagnet with a weakly temperature-dependent exchange-enhanced magnetic susceptibility of 0.93 X 10 8 m3/mol at 300 K that increases by less than 2% when cooling to 1.6 K (Chen et al. 1985). The originally reported superconductivity below 1.7 K (Chandrasekhar and Hulm 1958) was recently studied in more detail by Chen et al. (1985) who found Tc = 1.22 K and a critical field Ha = 1.7 T (extrapolated to 0 K). This compound represents an example of a regular U superconductor in the sense of the Hill plot because dv v 320 pm. Also the low value of y = 7.84 mJ/mol K2 is consistent with this picture. Compared to the other U-based superconductors (Meisner et al. 1984), UCo exhibits the highest Stoner enhancement parameter, S = 7. This can be correlated with the spin-fluctuation... 

Source Zeller, R. (2006) and the spin-polarized exchange-correlation integral, I c, calculated by the local spin density approximation. The Stoner parameter is, to a first approximation, element-specific and independent of the atom s local environment. 

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