The spectral weight (SW) for optical transitions in FeSi and MnSi are calculated as a function of temperature by means of linear muffin-tin orbital-local density approximation band calculations. The main effects, caused by structural disorder and electronic Fermi-Dirac distribution, act oppositely on the T dependence of the SW, while the variation of the magnetic moment in MnSi has only a minor effect. The calculations agree with the experimental findings of an increasing SW in FeSi and a decreasing SW in MnSi as function of T. The results can be understood from the change of the band structure with disorder.
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