Abstract
We have proposed a composite structure named as d-dot where a d-wave superconducting square dot is embedded in s-wave superconductor matrix. Spontaneous vortices with a half flux quantum should appear in the four corners of the d-dot because π phase shift of d-wave order parameter occurs at around corner junctions. The d-wave cuprate superconductor BSCCO dot surrounded by a conventional s-wave superconductor Pb is prepared by using a photolithography process, an Ar ion-milling method, a vacuum evaporation and a lift-off technique. Local magnetic flux distribution around the BSCCO single crystal d-dot is investigated by using a scanning SQUID microscope. The spontaneous half flux quantum is observed at one corner of the d-dot.
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