Polarization-dependent angle-resolved photoemission studies of untwinned single crystals of (Formula presented)(Formula presented)(Formula presented) (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 (Formula presented)(Formula presented)(Formula presented)(Formula presented) (Bi2212). Within experimental uncertainty, we find variation which is consistent with that expected for a (Formula presented) order parameter, providing additional evidence in support of the d-wave pairing hypothesis.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1997|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics