Abstract
We report on a systematic study of the London penetration depth λ 0 in a series of stoichiometric Chevrel phase compounds XMo 6S 8 (X=Ag, La, Y, Sc, Yb, Nd, Pr, Tm) in search for a possible correlation of λ 0 with T c as has been found before in solid solution of SnMo 6S 8− x Se x and PbMo 6S 8− x Se x (Birrer et al., Phys. Rev. B 48 (1993) 16589 [1]). In contrast to the solid solution compounds it seems that λ 0 is more or less the same for all stoichiometric compounds with T c⩾7 K and very much larger for compounds with T c⩽7 K. In NdMo 6S 8 and PrMo 6S 8 fast relaxation due to fluctuations of the 4f-electron moments masked completely the effect of the flux line lattice on the μ +-polarization in transverse field experiments, but it seems that the onset of superconductivity has some minute effect on the 4f-spin dynamics in NdMo 6S 8. Preliminary TF-studies in TmMo 6S 8 show the relaxation to be induced by the flux line lattice and the 4f-spin dynamics. We do not find any evidence for magnetic ordering of the Nd, Tm, Yb or Pr sublattice at low temperature. For Yb our results clearly show that Yb is in a nonmagnetic state in contrast to some previous reports (K.N. Shrivastava, K.P. Sinha, Phys. Rep. 115 (1984) 93).
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