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ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x

H. Ding·M. R. Norman·J. C. Campuzano·M. Randeria·A. F. Bellman·T. Yokoya·T. Takahashi·T. Mochiku·K. Kadowaki
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Abstract

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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H. Ding, M. R. Norman, J. C. Campuzano, M. Randeria, A. F. Bellman, T. Yokoya, T. Takahashi, T. Mochiku, K. Kadowaki. 1996-03-06. ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x. https://doi.org/10.1103/physrevb.54.r9678

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