Superconducting-gap anisotropy in YBa2Cu3O7−δ:mPhotoemission results on untwinned crystals

Matthias C. Schabel; C.-H. Park; A. Matsuura; Z. X. Shen; D. A. Bonn; Ruixing Liang; W. N. Hardy

doi:10.1103/PhysRevB.55.2796

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Superconducting-gap anisotropy in YBa2Cu3O7−δ:mPhotoemission results on untwinned crystals

Matthias C. Schabel, C.-H. Park, A. Matsuura, Z. X. Shen, D. A. Bonn, Ruixing Liang, W. N. Hardy

DOI 10.1103/PhysRevB.55.2796 · Physical Review B

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Abstract

Polarization-dependent angle-resolved photoemission studies of untwinned single crystals of YBa2Cu3O6.95 (Y123) reveal modifications of the near-Fermi-edge spectral weight which are indicative of an anisotropic superconducting gap. The measured magnitude of the leading edge shift increases monotonically from the Γ-S line toward the zone boundary, reaching a maximum value of approximately 25 meV, similar to the behavior seen in Bi2Sr2CaCu2O8+δ (Bi2212). Within experimental uncertainty, we find variation which is consistent with that expected for a dx2−y2 order parameter, providing additional evidence in support of the d-wave pairing hypothesis.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.95 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown