Abstract
In order to clarify unusual superconducting properties in a heavy fermion superconductor UBe13, we have carried out 9Be NMR measurements using a single crystal with Tc≅0.85K. The NMR spectra under the magnetic field H=3T parallel to [111] crystal axis show no change between Tc(H=3T)=0.64K and Ta(H=3T)=0.55K. Below Ta, however, the Knight shift for Be(II) decreased. The reduction of the Knight shift of Be(II) is amount to ∼0.01%, which is much smaller than spin part of the Knight shift, Ks∼0.1% estimated from Clogston Jaccarino plot. The origin of reduction of the Knight shift cannot be explained by spin singlet superconductivity.
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