Superconducting effects of Hgsub(3-delta)SbF6

The resistivity and AC susceptibility of Hgsub(3-delta)SbF6 cooled at different rates were measured between 1.4 and 4.2 K. There is a superconducting transition at 4.1 K in slowly cooled samples with no anistropy in the superconducting transition temperature for current directions parallel and perpendicular to the c axis. Superconductivity of fast cooled samples occurs below 3.9 K and susceptibility changes over a range of temperature. The superconductivity which depends on cooling rate is attributed to mercury trapped in isolated regions, with the size of the regions depending on the rate of cooling. (author)