Abstract
We have measured the resistance R and susceptiblity changes in (SnxEu1−x)yMo6S8, where 0⩽x⩽0.15 and y = 1.0 and 1.2, in the temperature range 1.5<T⩽250 K for varous hydrostatic pressures 0⩽P⩽21 kbar. For x⩽0.1 and P∼0, a resistance anomaly occurs at T∼100 K at which temperature dR/dT becomes negative and persists to the lowest temperatures attainable. The onset of the resistance anomaly, which we associate with a decreasing carrier concentration, shifts to lower temperatures as P is increased. For P∼7 kbar, these samples become superconducting even though the semiconductor-like resistance (dR/dT<0) remains. For 7⩽P⩽12 kbar, the superconducting transition temperature Tc increases sharply, even though the resistance anomaly persists. The Tc’s represent the highest pressure-induced superconducting transition temperature in any known low carrier density magnetic material We also discuss the effect of a magnetic field on the superconducting properties.
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