Abstract
A variety of ambient and high-pressure experimental results reveal the interplay between magnetism and superconductivity in Ho-doped samples of the pressure-induced superconductor, EuMo6S8. Ho concentrations up to 50 at. % of the rare-earth ions were used. High-resolution magnetic measurements are consistent with the crystalline electric field ground state for the Ho3+ ions being a magnetic doublet consisting largely of Jz =±8. The results of high-pressure magnetization experiments reveal negligible effects of reduced lattice constant on the rare earth-rare earth interactions. Resistivity in a 10 at. % sample for P=10 kbar shows the suppression of a P=0 structural transition, metallic conductivity down to low temperatures, and finally superconductivity at 8 K. The upper critical field, Hc2(T), for this sample was measured for P=7, 10, and 12 kbar and showed strong reentrant behavior [dHc2(T)/dT >0 as T→0 K]. A minimum with field in the resistivity above Hc2 was also observed at lowest temperatures. The Hc2(T) data are compared with those of EuMo6S8 at high pressure, which show positive curvature, and HoMo6S8, in which superconductivity is quenched by ferromagnetism at low temperatures.
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