Paramagnetic effect in YBaCuO grain boundary junctions
E.Il'ichev, F. Tafuri, M. Grajcar, R.P.J. IJsselsteijn, J. Weber, F., Lombardi, and J.R. Kirtley
TL;DR
This study investigates the magnetic response of YBaCuO grain boundary Josephson junctions, revealing a paramagnetic effect linked to d-wave symmetry and Andreev bound states through RF and SQUID microscopy.
Contribution
It provides new insights into the paramagnetic behavior in YBaCuO junctions, highlighting the role of order parameter symmetry and bound states.
Findings
Paramagnetic response observed at low fields in specific grain boundaries.
Response linked to d-wave symmetry and Andreev bound states.
Use of RF measurements and Scanning SQUID Microscopy to analyze magnetic behavior.
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.
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