We report NQR measurements in the filled-skutterudite compound superconductors Pr ( Os1 - x Rux )4 Sb12 ( x = 0.1, 0.2 ). 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 / T1 T )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.
- Impurity effect
- Pr ( Os Ru ) Sb
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering