The electronic band structures of the new superconducting (with T_c up to 7.7K) ternary silicides M(A_{ 0.5}Si_{ 0.5})_2 (M= Ca, Sr, Ba; A= Al, Ga) in the AlB_2-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.
Categories: cond-mat.supr-con