Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5: 115In-NQR study under pressure

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

doi:10.1016/j.jmmm.2003.11.335

Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn₅: ¹¹⁵In-NQR study under pressure

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

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

Abstract

We report systematic evolution of superconducting (SC) characteristic of heavy-fermion superconductor CeCoIn₅ via the nuclear-quadrupole- resonance (NQR) measurement under pressure (P). The temperature dependence of nuclear spin-lattice relaxation rate (1/T_l) below T_c has revealed that once the value of SC energy gap (2Δ₀/k _BT_c) slightly increases in P< 0.45 GPa, with further increasing P, it decreases significantly. By contrast, T_C increases monotonously up to 2.6K as P increases up to 1 GPa, exhibiting a saturation in P = 1.0-1.5GPa.

Original language	English
Pages (from-to)	e679-e681
Journal	Journal of Magnetism and Magnetic Materials
Volume	272-276
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/j.jmmm.2003.11.335
Publication status	Published - May 2004
Externally published	Yes

Keywords

Heavy fermions
Nuclear quadrupole resonance
Pressure effect
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2003.11.335

Cite this

Yashima, M., Kawasaki, S., Kawasaki, Y., Zheng, G. Q., Kitaoka, Y., Shishido, H., Settai, R., & Onuki, Y. (2004). Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn₅: ¹¹⁵In-NQR study under pressure. Journal of Magnetism and Magnetic Materials, 272-276(SUPPL. 1), e679-e681. https://doi.org/10.1016/j.jmmm.2003.11.335

Yashima, M, Kawasaki, S, Kawasaki, Y, Zheng, GQ, Kitaoka, Y, Shishido, H, Settai, R & Onuki, Y 2004, 'Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn₅: ¹¹⁵In-NQR study under pressure', Journal of Magnetism and Magnetic Materials, vol. 272-276, no. SUPPL. 1, pp. e679-e681. https://doi.org/10.1016/j.jmmm.2003.11.335

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title = "Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5: 115In-NQR study under pressure",

abstract = "We report systematic evolution of superconducting (SC) characteristic of heavy-fermion superconductor CeCoIn5 via the nuclear-quadrupole- resonance (NQR) measurement under pressure (P). The temperature dependence of nuclear spin-lattice relaxation rate (1/Tl) below Tc has revealed that once the value of SC energy gap (2Δ0/k BTc) slightly increases in P< 0.45 GPa, with further increasing P, it decreases significantly. By contrast, TC increases monotonously up to 2.6K as P increases up to 1 GPa, exhibiting a saturation in P = 1.0-1.5GPa.",

keywords = "Heavy fermions, Nuclear quadrupole resonance, Pressure effect, Superconductivity",

author = "M. Yashima and S. Kawasaki and Y. Kawasaki and Zheng, {G. Q.} and Y. Kitaoka and H. Shishido and R. Settai and Y. Onuki",

note = "Funding Information: This work was supported by the COE Research grant (10CE2004) of Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture of Japan.",

year = "2004",

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T1 - Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5

T2 - 115In-NQR study 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 - Onuki, Y.

N1 - Funding Information: This work was supported by the COE Research grant (10CE2004) of Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture of Japan.

PY - 2004/5

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AB - We report systematic evolution of superconducting (SC) characteristic of heavy-fermion superconductor CeCoIn5 via the nuclear-quadrupole- resonance (NQR) measurement under pressure (P). The temperature dependence of nuclear spin-lattice relaxation rate (1/Tl) below Tc has revealed that once the value of SC energy gap (2Δ0/k BTc) slightly increases in P< 0.45 GPa, with further increasing P, it decreases significantly. By contrast, TC increases monotonously up to 2.6K as P increases up to 1 GPa, exhibiting a saturation in P = 1.0-1.5GPa.

KW - Heavy fermions

KW - Nuclear quadrupole resonance

KW - Pressure effect

KW - Superconductivity

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