TY - JOUR

T1 - Fourfold symmetry in the plane of the upper critical field for single-cr

T2 - Evidence for pairing in a high superconductor

AU - Koike, Yoji

AU - Takabayashi, Tsutomu

AU - Noji, Takashi

AU - Nishizaki, Terukazu

AU - Kobayashi, Norio

PY - 1996/1/1

Y1 - 1996/1/1

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.54.R776

DO - 10.1103/PhysRevB.54.R776

M3 - Article

AN - SCOPUS:0000770672

VL - 54

SP - R776-R779

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 0163-1829

IS - 2

ER -