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

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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

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nuclear quadrupole resonance
superconductivity
fermions
heavy fermion superconductors
spin-lattice relaxation
nuclear spin

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Evidence for Unconventional Strong-Coupling Superconductivity in [Formula presented] : An Sb Nuclear Quadrupole Resonance Study. / Kotegawa, H.; Yogi, M.; Imamura, Y.; Kawasaki, Y.; Zheng, Guo-Qing; Kitaoka, Y.; Ohsaki, S.; Sugawara, H.; Aoki, Y.; Sato, H.

In: Physical Review Letters, Vol. 90, No. 2, 01.01.2003.

Research output: Contribution to journalArticle

Kotegawa, H. ; Yogi, M. ; Imamura, Y. ; Kawasaki, Y. ; Zheng, Guo-Qing ; Kitaoka, Y. ; Ohsaki, S. ; Sugawara, H. ; Aoki, Y. ; Sato, H. / Evidence for Unconventional Strong-Coupling Superconductivity in [Formula presented] : An Sb Nuclear Quadrupole Resonance Study. In: Physical Review Letters. 2003 ; Vol. 90, No. 2.
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