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

doi:10.1143/JPSJ.74.1938

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 journal › Article › peer-review

11 Citations (Scopus)

Abstract

We have carried out nuclear quadrupole resonance (NQR) measurements in the filled skutterudite compounds Pr(Os_1-xRu_x) 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 T_c, 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 language	English
Pages (from-to)	1938-1941
Number of pages	4
Journal	journal of the physical society of japan
Volume	74
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.74.1938
Publication status	Published - Jul 2005

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.74.1938

Cite this

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

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.",

keywords = "Filled skutterudite, Heavy fermion, Impurity effect, Nuclear quadrupole resonance, Residual DOS, Superconductivity",

author = "Masahide Nishiyama and Takayuki Kato and Hitoshi Sugawara and Daisuke Kikuchi and Hideyuki Sato and Hisatomo Harima and Zheng, {Guo Qing}",

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T1 - Impurity effect as a probe for the gap function in the filled skutterudite compound superconductor PrOs4Sb12

T2 - Sb-NQR study

AU - Nishiyama, Masahide

AU - Kato, Takayuki

AU - Sugawara, Hitoshi

AU - Kikuchi, Daisuke

AU - Sato, Hideyuki

AU - Harima, Hisatomo

AU - Zheng, Guo Qing

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N2 - 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.

AB - 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.

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KW - Impurity effect

KW - Nuclear quadrupole resonance

KW - Residual DOS

KW - Superconductivity

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