Abstract
9 Be nuclear magnetic resonance (NMR) measurements have been carried out for a single crystal UBe 13 with T c =0.86 K, in order to clarify unusual properties in the normal state. For the applied field parallel to [001] direction, a well-split 9 Be NMR spectrum due to the nuclear electric quadrupole interaction is obtained in H =7 T. When the magnetic field is applied to [111] direction, the quadrupole split Be(II) lines gather around the central line. 9 Be nuclear spin–lattice relaxation rate has been measured for Be(I) and Be(II) sites for H ∥[111] in 7 T. 1/ T 1 s for both sites are found to obey √T in the temperature range of 1.5–4 K, suggesting that the antiferromagnetic spin fluctuations exist. Above 4 K, 1/ T 1 for the Be(II) site weakly depnends on temperature, whereas that for the Be(I) site is independent of temperature.
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