Evidence for Unconventional Strong-Coupling Superconductivity in [Formula presented]: An Sb Nuclear Quadrupole Resonance Study

H. Kotegawa, M. Yogi, Y. Imamura, Y. Kawasaki, Guo-Qing Zheng, Y. Kitaoka, S. Ohsaki, H. Sugawara, Y. Aoki, H. Sato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report Sb-NQR results which evidence a heavy-fermion (HF) behavior and an unconventional superconducting (SC) property in [Formula presented] with [Formula presented]. The temperature ([Formula presented]) dependence of nuclear-spin-lattice-relaxation rate, [Formula presented], and NQR frequency unravel a low-lying crystal-electric-field splitting below [Formula presented], associated with [Formula presented]-derived ground state. In the SC state, [Formula presented] shows neither a coherence peak just below [Formula presented] nor a [Formula presented]-like power-law behavior observed for anisotropic HF superconductors with the line-node gap. The isotropic energy gap with its size [Formula presented] seems to open up across [Formula presented] below [Formula presented]. It is surprising that [Formula presented] looks like an isotropic HF superconductor—it may indeed argue for Cooper pairing via quadrupolar fluctuations.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number2
DOIs
Publication statusPublished - Jan 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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