Half-Integer Flux Quantum Effect in Tricrystal Bi2Sr2CaCu2O8+delta

We have used a scanning SQUID microscope to directly observe the half-integer flux quantum effect, in epitaxial films of Bi2Sr2CaCu2O8+delta at the meeting point of a tricrystal substrate of SrTiO3 in a geometry chosen to show this effect for a d-wave superconductor. This observation, when considered along with recent photoemission results, proves that the in-plane order parameter for this high-Tc cuprate superconductor closely follows dx2-y2 symmetry.

By: J. R. Kirtley, C. C. Tsuei, H. Raffy (Univ. Paris-sud, France), Z. Z. Li (Univ. Paris-sud, France), A. Gupta, J. Z. Sun, S. Megtert (Univ. Paris-sud, France)

Published in: Europhysics Letters, volume 36, (no 9), pages 707-12 in 1996

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