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ABSTRACT: We report NQR measurements in the filled-skutterudite compound superconductors . Upon replacing Os with Ru, the spin–lattice relaxation rate 1/T1 becomes proportional to temperature (T) at low temperatures far below Tc, and the magnitude of (1/T1T)low-T increases with increasing Ru content. These results indicate that a finite density of states are induced at the Fermi level by the impurity, suggesting that there exist nodes in the gap function of PrOs4Sb12.
Physica B: Condensed Matter.
