Vortex structure in weak to strong coupling superconductors: Crossover from BCS to BEC

Masahiko Machida, Tomio Koyama, Yoji Ohashi

研究成果: Article査読

抄録

High-Tc cuprate and MgB2 superconductors are recognized as intermediate or strong coupling superconductors. In such a non-weak regime, the vortex core structure is an interesting issue, since the vortex dissipation is expected to be anomalously reduced due to large level distance between localized core states. In this paper, we systematically clarify the vortex core structure based on the fermion-boson model which can cover a full coupling range from weak BCS to strong BEC superconductors. The mean-field calculations on the model reveal that the distances between the low-lying core levels expand and the low-lying states finally disappear when changing the coupling from weak BCS to strong BEC regime. This result suggests that the strong coupling makes the vortex motion non-dissipative.

本文言語English
ページ(範囲)194-197
ページ数4
ジャーナルPhysica C: Superconductivity and its applications
445-448
1-2
DOI
出版ステータスPublished - 2006 10月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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