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[Mu]SR studies of 2H-NbSe2 Miller, Roger


We report fx+SR measurements in NbSe2 of the penetration depth, A, and the core radius, /9, as a function of temperature and magnetic field. We find that A(H=0T)=1490(11)A at T=4.2K and />(H=0T)=248(2)A at T=4.2K. We observe a field dependence in 1/A2 and a strong field dependence in the core radius at fields H<6kG. We also find a temperature dependence in the core radius below T/Tc=0.3, where the penetration depth is constant, contrary to Landau-Ginzburg theory. The temperature dependence, however, is much weaker than that predicted by Kramer and Pesch [24], with p(T=0K)=74.6(2)A in an applied field of 5k G.

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