Chemical Trend of Superconducting Transition Temperature in Hole-doped   Delafossite of CuAlO_2, AgAlO_2 and AuAlO_2
  We have performed the first-principles calculations about the superconducting transition temperature T_c of hole-doped delafossite CuAlO_2, AgAlO_2 and AuAlO_2. Calculated T_c are about 50 K(CuAlO_2), 40 K(AgAlO_2) and 3 K(AuAlO_2) at maximum in the optimum hole-doping concentration. The low T_c of AuAlO_2 is attributed to the weak electron-phonon interaction caused by the low covalency and heavy atomic mass. 
Akitaka Nakanishi and Hiroshi Katayama-Yoshida
cond-mat.supr-con