Multigap superconductivity in Y2C3: A 13C-NMR study

A. Harada; S. Akutagawa; Y. Miyamichi; H. Mukuda; Y. Kitaoka; J. Akimitsu

doi:10.1143/JPSJ.76.023704

Multigap superconductivity in Y₂C₃: A ¹³C-NMR study

A. Harada, S. Akutagawa, Y. Miyamichi, H. Mukuda, Y. Kitaoka, J. Akimitsu

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

32 Citations (Scopus)

Abstract

We report on the superconducting properties of Y₂C₃ with a relatively high transition temperature T_c = 15.7 K investigated by ¹³C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The ¹³C Knight shift has revealed a significant decrease below T_c, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T₁ in the superconducting state, Y₂C₃ is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/k_BT_c = 5 at the main band and a small gap 2Δ/k_BT_c = 2 at other bands. These results have revealed that Y₂C₃ is a unique multigap s-wave superconductor similar to MgB₂.

Original language	English
Article number	023704
Journal	journal of the physical society of japan
Volume	76
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.76.023704
Publication status	Published - Feb 2007
Externally published	Yes

Keywords

Lanthanoid carbide
Metal
Multigap
NMR
Superconductivity
YC

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.023704

Cite this

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title = "Multigap superconductivity in Y2C3: A 13C-NMR study",

abstract = "We report on the superconducting properties of Y2C3 with a relatively high transition temperature Tc = 15.7 K investigated by 13C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The 13C Knight shift has revealed a significant decrease below Tc, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1 in the superconducting state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/kBTc = 5 at the main band and a small gap 2Δ/kBTc = 2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.",

keywords = "Lanthanoid carbide, Metal, Multigap, NMR, Superconductivity, YC",

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T2 - A 13C-NMR study

AU - Harada, A.

AU - Akutagawa, S.

AU - Miyamichi, Y.

AU - Mukuda, H.

AU - Kitaoka, Y.

AU - Akimitsu, J.

PY - 2007/2

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N2 - We report on the superconducting properties of Y2C3 with a relatively high transition temperature Tc = 15.7 K investigated by 13C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The 13C Knight shift has revealed a significant decrease below Tc, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1 in the superconducting state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/kBTc = 5 at the main band and a small gap 2Δ/kBTc = 2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.

AB - We report on the superconducting properties of Y2C3 with a relatively high transition temperature Tc = 15.7 K investigated by 13C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The 13C Knight shift has revealed a significant decrease below Tc, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1 in the superconducting state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/kBTc = 5 at the main band and a small gap 2Δ/kBTc = 2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.

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