Paramagnetic effect in YBaCuO grain boundary junctions
arXiv:cond-mat/0306722 · doi:10.1103/PhysRevB.68.014510
Abstract
A detailed investigation of the magnetic response of YBaCuO grain boundary Josephson junctions has been carried out using both radio-frequency measurements and Scanning SQUID Microscopy. In a nominally zero-field-cooled regime we observed a paramagnetic response at low external fields for 45 degree asymmetric grain boundaries. We argue that the observed phenomenology results from the d-wave order parameter symmetry and depends on Andreev bound states.
To be published in Phys. Rev. B