Anomalously large gap anisotropy in the a-b plane of
- 8 March 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (10), 1553-1556
- https://doi.org/10.1103/physrevlett.70.1553
Abstract
Superconducting gap anisotropy at least an order of magnitude larger than that of the conventional superconductors has been observed in the a-b plane of in angle-resolved photoemission spectroscopy. For samples with of 88 K, the gap size reaches a maximum of approximately 20 meV along the Cu-O bond direction, and a minimum of much smaller or vanishing magnitude 45° away. The experimental data are discussed within the context of various theoretical models. In particular, a detailed comparison with what is expected from a superconductor with a - order parameter is carried out, yielding a consistent picture.
Keywords
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