Normal and superconducting properties of EuMo6S8 in high magnetic fields

The variation of the electrical resistance R of EuMo6S8 with temperature T and applied magnetic field H was determined at pressures P to 19 kbar. At ambient pressure, the results are in agreement with previous work on samples of similar quality, where it was determined that variations of the carrier concentration were responsible for the very strong dependence of R on T and H. At P = 8.5 kbar, the magnetoresistance is determined by the freezing out of the Eu2+ spins as H increases. For P > 13 kbar, EuMo6S8 exhibits bulk superconductivity, and the authors investigated the upper critical magnetic field H/sub c2/(T). The analysis of these results shows that their EuMo6S8 samples are clean superconductors. They observe that H/sub c2/ is strongly reduced by pressure, perhaps due to an increase of the carrier concentration with pressure