Impurity effect as a probe for the gap function in the filled skutterudite compound superconductor PrOs4Sb12: Sb-NQR study

Masahide Nishiyama, Takayuki Kato, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Hisatomo Harima, Guo Qing Zheng

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We have carried out nuclear quadrupole resonance (NQR) measurements in the filled skutterudite compounds Pr(Os1-xRux) 4Sb12 (x = 0.1, 0.2), in order to gain insights into the symmetry of the superconducting gap function. Upon replacing Os with Ru, the spin-lattice relaxation rate 1/T1 becomes proportional to temperature (T) at low T far below Tc, and the magnitude of (1/T 1T)low-T increases with increasing Ru content. These results indicate that a finite density of states is induced at the Fermi level by the impurity, and thus suggest that there exist nodes in the gap function of PrOs4Sb12.

Original languageEnglish
Pages (from-to)1938-1941
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number7
DOIs
Publication statusPublished - Jul 1 2005

Keywords

  • Filled skutterudite
  • Heavy fermion
  • Impurity effect
  • Nuclear quadrupole resonance
  • Residual DOS
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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