Band structure of new superconducting AlB2-like ternary silicides M(Al0.5Si0.5)2 and M(Ga0.5Si0.5)2 (M= Ca, Sr and Ba)
Abstract
The electronic band structures of the new superconducting (with Tc up to 7.7K) ternary silicides M(A0.5Si0.5)2 (M= Ca, Sr, Ba; A= Al, Ga) in the AlB2-type structure have been investigated using the full-potential LMTO method. The calculations showed that the trend in transition temperatures doesn't follow the changes in the density d-states at the Fermi level and probably is associated with phonon-mode frequencies.
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