Abstract
105Pd NMR and NQR measurements have been performed both in the normal and in the superconducting states for UPd 2Al 3. In the antiferromagnetically (AF) ordered state, the small internal field of about 3 kOe (at 4.2 K), which is perpendicular to the c-axis, appears below 14.5 K and does not decrease in the superconducting state. The nuclear spin-lattice relaxation rate, 1/ T 1, in UPd 2Al 3 is nearly temperature, T, independent in the paramagnetic state up to 60 K, successively diverges at Néel temperature associated with the critical slowing down of U magnetic moments, and then decreases markedly in the AF ordered state. In the superconducting state, 1/ T 1 decreases in proportion to T 3 down to 0.4 K with no coherence peak just below T C, which indicates the occurrence of anisotropic superconductivity having line nodes in the superconducting energy gap.
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