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Science 10 February 1995:
Vol. 267. no. 5199, pp. 862 - 865
DOI: 10.1126/science.267.5199.862
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Articles

Temperature Dependence of the Superconducting Gap Anisotropy in Bi2Sr2CaCu2O8+x

Jian Ma 1, C. Quitmann 1, R. J. Kelley 1, H. Berger 2, G. Margaritondo 2, and M. Onellion 1

1 Department of Physics and Applied Superconductivity Center, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706, USA.
2 Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland

Detailed data on the momentum-resolved temperature dependence of the superconducting gap of Bi2Sr2CaCu2O8+x are presented, complemented by similar data on the intensity of the photoemission superconducting condensate spectral area. The gap anisotropy between the Ggr-Mand Ggr-X directions increases markedly with increasing temperature, contrary to what happens for conventional anisotropic-gap superconductors, such as lead. Specifically, the size of the superconducting gap along the Ggr-X direction decreases to values indistinguishable from zero at temperatures for which the gap retains virtually full value along the Ggr-M direction. These data rule out the simplest type of d-wave order parameter.

Submitted on September 8, 1994
Accepted on December 1, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Temperature Dependence of the Half-Integer Magnetic Flux Quantum.
J. R. Kirtley, C. C. Tsuei, and K. A. Moler (1999)
Science 285, 1373-1375
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