Half-integer flux quantum effect in tricrystal Bi2Sr2CaCu2O8+δ
IBM T.J. Watson Research Center -
P.O.Box 218, Yorktown Heights, NY 10598, USA
2 Laboratoire de Physique des Solides, Université Paris-sud - 91405 Orsay, France
Accepted: 6 November 1996
We have used a scanning SQUID microscope to directly observe the half-integer flux quantum effect, in epitaxial films of , at the meeting point of a tricrystal substrate of 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 symmetry.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.72.Hs – Bi-based compounds / 74.20.-z – Superconductivity: theory
© EDP Sciences, 1996