ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x

Details ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x

1996-03-06

arxiv.org/abs/cond-mat/9603044v1

Phys Rev B 54, R9678 (1996)

Physics

Condensed Matter

3 pages, revtex, 4 postscript figures

Scientific paper

10.1103/PhysRevB.54.R9678

We report measurements of the momentum dependence of the superconducting gap in Bi_2Sr_2CaCu_2O_{8+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(k_x)-cos(k_y) 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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