Evidence for nodes in the superconducting energy gap of the skutterudite compound PrOs4Sb12

M. Nishiyama; T. Kato; H. Sugawara; D. Kikuchi; H. Sato; H. Harima; G. Q. Zheng

doi:10.1016/j.physb.2006.01.072

Evidence for nodes in the superconducting energy gap of the skutterudite compound PrOs₄Sb₁₂

M. Nishiyama, T. Kato, H. Sugawara, D. Kikuchi, H. Sato, H. Harima, G. Q. Zheng

School of Science

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report NQR measurements in the filled-skutterudite compound superconductors Pr ( Os_{1 - x} Ru_x )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 T_c, 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.

Original language	English
Pages (from-to)	192-193
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	378-380
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2006.01.072
Publication status	Published - May 1 2006

Keywords

Impurity effect
NQR
Pr ( Os Ru ) Sb
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2006.01.072

Cite this

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title = "Evidence for nodes in the superconducting energy gap of the skutterudite compound PrOs4Sb12",

abstract = "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.",

keywords = "Impurity effect, NQR, Pr ( Os Ru ) Sb, Superconductivity",

author = "M. Nishiyama and T. Kato and H. Sugawara and D. Kikuchi and H. Sato and H. Harima and Zheng, {G. Q.}",

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T1 - Evidence for nodes in the superconducting energy gap of the skutterudite compound PrOs4Sb12

AU - Nishiyama, M.

AU - Kato, T.

AU - Sugawara, H.

AU - Kikuchi, D.

AU - Sato, H.

AU - Harima, H.

AU - Zheng, G. Q.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - 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.

AB - 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.

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KW - Pr ( Os Ru ) Sb

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