Magnetic criticality and unconventional superconductivity in CeCoIn 5: Study of 115in-nuclear quadrupole resonance under pressure

M. Yashima; S. Kawasaki; Y. Kawasaki; G. Q. Zheng; Y. Kitaoka; H. Shishido; R. Settai; Y. Haga; Y. Onuki

doi:10.1143/JPSJ.73.2073

Magnetic criticality and unconventional superconductivity in CeCoIn ₅: Study of ¹¹⁵in-nuclear quadrupole resonance under pressure

M. Yashima, S. Kawasaki, Y. Kawasaki, G. Q. Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Haga, Y. Onuki

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

55 Citations (Scopus)

Abstract

We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T₁ that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. T_c, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.

Original language	English
Pages (from-to)	2073-2076
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.73.2073
Publication status	Published - Aug 1 2004

Keywords

CeCoIn
Heavy fermion
NQR
Pressure
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.73.2073

Cite this

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title = "Magnetic criticality and unconventional superconductivity in CeCoIn 5: Study of 115in-nuclear quadrupole resonance under pressure",

abstract = "We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.",

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T2 - Study of 115in-nuclear quadrupole resonance under pressure

AU - Yashima, M.

AU - Kawasaki, S.

AU - Kawasaki, Y.

AU - Zheng, G. Q.

AU - Kitaoka, Y.

AU - Shishido, H.

AU - Settai, R.

AU - Haga, Y.

AU - Onuki, Y.

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N2 - We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.

AB - We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.

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KW - Superconductivity

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