Superconductivity of metallic aluminum antimonide. 
The high-pressure metallic phase of aluminunm antimnonide is super conducting [critical temperature T(c) (P approximately 125 kilobars) = 2.8 degrees +/-0.2 degrees K].  This transition temperature is significantly lower than the transition temperature of metallic germanium under an equivalent high pressure.  A similar result had been previously found for superconducting indiumantimonide in comparison to tin.