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Abstract
The superconducting and magnetic properties of the Yb /SUB 1.2-x/ Eu /SUB x/ Mo/sub 6/S/sub 8/ series of compounds have been investigated by means of ac magnetic susceptibility, electrical resistivity, and upper critical magnetic field H /SUB c2/ measurements. The superconducting transition temperature at ambient pressure is depressed by Eu additions, until superconductivity disappears completely at x about0.7. For Eu concentrations x<0.45, H /SUB c2/ is enhanced at low temperatures and exceeds the values for pure Yb /SUB 1.2/ Mo/sub 6/S/sub 8/. The temperature dependence of H /SUB c2/ for the various Yb /SUB 1.2-x/ Eu /SUB x/ Mo/sub 6/S/sub 8/ compounds is analyzed using a multiple pair-breaking theory that includes the compensation of the applied magnetic field by the negative exchange field produced by antiferromagnetic interactions between the conduction electron spins and the Eu/sup 2 +/ spins (Jaccarino-Peter effect). Hydrostatic pressure was found to induce superconductivity in all Eu-rich compositions that were not superconducting at ambient pressure.
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