Quasiparticle electronic structure of a new surperconductor, Y 2C3, in the mixed state investigated by specific heat and flux-flow resistivity

Satoshi Akutagawa; Takeyoshi Ohashi; Haruhisa Kitano; Atsutaka Maeda; Jun Goryo; Hiroshi Matsukawa; Jun Akimitsu

doi:10.1143/JPSJ.77.064701

Quasiparticle electronic structure of a new surperconductor, Y ₂C₃, in the mixed state investigated by specific heat and flux-flow resistivity

Satoshi Akutagawa, Takeyoshi Ohashi, Haruhisa Kitano, Atsutaka Maeda, Jun Goryo, Hiroshi Matsukawa, Jun Akimitsu

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

8 Citations (Scopus)

Abstract

In this paper, we investigate the electronic structure of quasiparticle in the vortex state of Y₂C₃ by the measurements of the specific heat, C, and the flux-flow resistivity, ρ_f. In contrast to a conventional s-wave superconductor, C/T and ρ_f showed nonlinear B dependences at low temperatures. The result is discussed in terms of the two gap superconductivity. We estimated the viscosity and the mean free path of the quasiparticles in the vortex core for Y₂C₃. While we found that Y₂C₃ is a clean superconductor in a previous study, the mean free path of the quasiparticles in the vortex core was limited to the coherence length because of the Andreev reflection at the vortex-core boundary in this study.

Original language	English
Article number	064701
Journal	journal of the physical society of japan
Volume	77
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.77.064701
Publication status	Published - Jun 2008
Externally published	Yes

Keywords

Flux-flow resistivity
Inversion symmetry
Microwave
Specific heat
Superconductivity
Surface impedance
Two gap

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.77.064701

Cite this

Quasiparticle electronic structure of a new surperconductor, Y ₂C₃, in the mixed state investigated by specific heat and flux-flow resistivity. / Akutagawa, Satoshi; Ohashi, Takeyoshi; Kitano, Haruhisa; Maeda, Atsutaka; Goryo, Jun; Matsukawa, Hiroshi; Akimitsu, Jun.

In: journal of the physical society of japan, Vol. 77, No. 6, 064701, 06.2008.

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

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abstract = "In this paper, we investigate the electronic structure of quasiparticle in the vortex state of Y2C3 by the measurements of the specific heat, C, and the flux-flow resistivity, ρf. In contrast to a conventional s-wave superconductor, C/T and ρf showed nonlinear B dependences at low temperatures. The result is discussed in terms of the two gap superconductivity. We estimated the viscosity and the mean free path of the quasiparticles in the vortex core for Y2C3. While we found that Y2C3 is a clean superconductor in a previous study, the mean free path of the quasiparticles in the vortex core was limited to the coherence length because of the Andreev reflection at the vortex-core boundary in this study.",

keywords = "Flux-flow resistivity, Inversion symmetry, Microwave, Specific heat, Superconductivity, Surface impedance, Two gap",

author = "Satoshi Akutagawa and Takeyoshi Ohashi and Haruhisa Kitano and Atsutaka Maeda and Jun Goryo and Hiroshi Matsukawa and Jun Akimitsu",

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AU - Akutagawa, Satoshi

AU - Ohashi, Takeyoshi

AU - Kitano, Haruhisa

AU - Maeda, Atsutaka

AU - Goryo, Jun

AU - Matsukawa, Hiroshi

AU - Akimitsu, Jun

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N2 - In this paper, we investigate the electronic structure of quasiparticle in the vortex state of Y2C3 by the measurements of the specific heat, C, and the flux-flow resistivity, ρf. In contrast to a conventional s-wave superconductor, C/T and ρf showed nonlinear B dependences at low temperatures. The result is discussed in terms of the two gap superconductivity. We estimated the viscosity and the mean free path of the quasiparticles in the vortex core for Y2C3. While we found that Y2C3 is a clean superconductor in a previous study, the mean free path of the quasiparticles in the vortex core was limited to the coherence length because of the Andreev reflection at the vortex-core boundary in this study.

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KW - Superconductivity

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