Fourfold symmetry in the plane of the upper critical field for single-cr: Evidence for pairing in a high superconductor

Yoji Koike, Tsutomu Takabayashi, Takashi Noji, Terukazu Nishizaki, Norio Kobayashi

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We have found clear anisotropy in the (Formula presented) plane with fourfold symmetry of the upper critical field for single-crystal (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented), which is very similar to that formerly observed in (Formula presented)(Formula presented)Cu(Formula presented) . This is neither attributed to the twin structure in the orthorhombic phase nor to the anisotropy of the Fermi surface but is explained as being mainly due to the anisotropy of the superconducting energy gap owing to (Formula presented) pairing, which supports (Formula presented) pairing in a high-(Formula presented) superconductor.

Original languageEnglish
Pages (from-to)R776-R779
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number2
DOIs
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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