paper

Temperature dependence of the superconducting gap anisotropy in Bi $_{2}$ Sr $_{2}$ Ca $_{1}$ Cu $_{2}$ O $_{8 + x}$

arXiv:cond-mat/9404056 · doi:10.1016/0921-4534(94)92159-8

Abstract

We present the first detailed data of the momentum-resolved, temperature dependence of the superconducting gap of $B i_{2} S r_{2} C a_{1} C u_{2} O_{8 + x}$ , complemented by similar data on the intensity of the photoemission superconducting condensate spectral area. The gap anisotropy between the $I^ - M ˉ$ and $I^ - X$ 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 $I^ - X$ direction decreases to values indistinguishable from zero at temperatures for which the gap retains virtually full value along the $I^ - M ˉ$ direction.

APS_REVTEX. 19 pages, including 8 figures, available upon request. UW-Madison preprint

Temperature dependence of the superconducting gap anisotropy in Bi2​Sr2​Ca1​Cu2​O8+x​

Abstract

Temperature dependence of the superconducting gap anisotropy in Bi $_{2}$ Sr $_{2}$ Ca $_{1}$ Cu $_{2}$ O $_{8 + x}$