A detailed investigation of the magnetic response of YBa2Cu3Ox grain-boundary Josephson junctions has been carried out using both radio-frequency measurements and scanning superconducting quantum interference device microscopy. In a nominally zero-field-cooled regime we observed a paramagnetic response at low external fields for 45° asymmetric grain boundaries. We argue that the observed phenomenology results from the d-wave order-parameter symmetry and depends on Andreev bound states.
Paramagnetic effect inYBCO grain boundary junctions / Il'Ichev, E.; Tafuri, Francesco; Grajcar, M.; Ijsselsteijn, R. P. J.; Weber, J.; Lombardi, F.; Kirtley, J. R.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 68:(2003), pp. 14510-14514. [10.1103/PhysRevB.68.014510]
Paramagnetic effect inYBCO grain boundary junctions
Tafuri, Francesco;
2003
Abstract
A detailed investigation of the magnetic response of YBa2Cu3Ox grain-boundary Josephson junctions has been carried out using both radio-frequency measurements and scanning superconducting quantum interference device microscopy. In a nominally zero-field-cooled regime we observed a paramagnetic response at low external fields for 45° asymmetric grain boundaries. We argue that the observed phenomenology results from the d-wave order-parameter symmetry and depends on Andreev bound states.| File | Dimensione | Formato | |
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