Abstract
Field-angle dependence of 9Be-NMR measurements has been carried out for a single crystal UBe 13 in the temperature range of 0.35–1.5 K. For H ∥ [ 0 0 1 ] , we observed that 9Be-NMR spectra consisted of 10 lines; one line comes from a Be(I) site located in the cubic symmetry, while nine lines come from Be(II) sites located in the lower symmetry. From the field angle dependence of the NMR spectra, we determined NQR parameters such as the nuclear quadrupole frequency ( ν Q ≈ 84 kHz ) and the asymmetry parameter ( η ≈ 0.21 ) . In the superconducting state, we found that 9Be-NMR Knight shift for H ∥ [ 0 0 1 ] does not change at all. This result is consistent with the spin-triplet pairing state in UBe 13 .
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