Multigap Superconductivity in Y$_2$C$_3$: A $^{13}$C-NMR Study

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

doi:10.1143/JPSJ.76.023704

Multigap Superconductivity in Y$_2$C$_3$: A $^{13}$C-NMR Study

Superconductivity 2009-11-11 v1

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

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Abstract

We report on the superconducting (SC) properties of Y $_2$ C $_3$ with a relatively high transition temperature $T_{\rm c}=15.7$ K investigated by $^{13}$ C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The $^{13}$ C Knight shift has revealed a significant decrease below $T_{\rm c}$ , suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ in the SC state, Y $_2$ C $_3$ is demonstrated to be a multigap superconductor that exhibits a large gap $2\Delta/k_{\rm B}T_{\rm c}=5$ at the main band and a small gap $2\Delta/k_{\rm B}T_{\rm c}=2$ at other bands. These results have revealed that Y $_2$ C $_3$ is a unique multigap s-wave superconductor similar to MgB $_2$ .

Keywords

multigap superconductivity Y2C3 NMR Knight shift spin-lattice relaxation rate s-wave superconductor

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@article{arxiv.cond-mat/0612578,
  title  = {Multigap Superconductivity in Y$_2$C$_3$: A $^{13}$C-NMR Study},
  author = {A. Harada and S. Akutagawa and Y. Miyamichi and H. Mukuda and Y. Kitaoka and J. Akimitsu},
  journal= {arXiv preprint arXiv:cond-mat/0612578},
  year   = {2009}
}

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4 pages, 5 figures

Multigap Superconductivity in Y$_2$C$_3$: A $^{13}$C-NMR Study

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