Doping-Induced Change of Superconducting Gap Anisotropy in Bi 2 Sr 2 Ca 1 Cu 2 O 8+ δ
- 1 March 1996
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 271 (5253) , 1255-1257
- https://doi.org/10.1126/science.271.5253.1255
Abstract
High-resolution angle-resolved photoemission measurements were performed on single crystals of Bi 2 Sr 2 Ca 1 Cu 2 O 8+ δ with different oxygen stoichiometries. The data establish that the gap anisotropy (ratio of the gap along Γ-M to the gap along Γ-X) can be reversibly changed from ∼20:1 (optimal or underdoped) to ∼2:1 (overdoped). Differences in sample doping explain the conflicting reports on gap anisotropy in the literature. Possible effects of this change in gap anisotropy on the symmetry of the order parameter are discussed. There remains some ambiguity as to the relation between the order parameter and doping.Keywords
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