ARPES Study of the Superconducting Gap Anisotropy in Bi2Sr2CaCu2O8+x
H. Ding, M. R. Norman, J. C. Campuzano, M. Randeria, A. F. Bellman, T. Yokoya, T. Takahashi, T. Mochiku, K. Kadowaki
Abstract
We report measurements of the momentum dependence of the superconducting gap in Bi2Sr2CaCu2O8+x (Bi2212) with angle-resolved photoemission spectroscopy using a dense sampling of the Brillouin zone in the vicinity of the Fermi surface. In the Y quadrant of the zone, where there are no complications from ghost bands caused by the superlattice, we find a gap function consistent within error bars to the form cos(kx)-cos(ky) expected for a d-wave order parameter. Similar results are found in the X quadrant with the photon polarization chosen to enhance main band emission over that due to ghost bands.
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