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

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K. Kadowaki

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classification ❄️ cond-mat supr-con

keywords bandscacughostquadrantsuperconductingzoneangle-resolvedanisotropy

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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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ARPES Study of the Superconducting Gap Anisotropy in Bi₂Sr₂CaCu₂O₈+x

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