Paramagnetic effect in YBaCuO grain boundary junctions

Details Paramagnetic effect in YBaCuO grain boundary junctions Paramagnetic effect in YBaCuO grain boundary junctions

2003-06-29

arxiv.org/abs/cond-mat/0306722v1

Phys. Rev. B 68, 014510 (2003)

Physics

Condensed Matter

Superconductivity

To be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.014510

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.

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