Anomalous Periodicity of the Current-Phase Relationship of Grain-Boundary Josephson Junctions in High-Tc Superconductors
E. Il'ichev, V. Zakosarenko, R.P.J. IJsselsteijn, H. E. Hoenig, V., Schultze, H.-G. Meyer, M. Grajcar, R. Hlubina
TL;DR
This paper experimentally demonstrates an anomalous half-fluxon periodicity in the current-phase relation of grain-boundary Josephson junctions in high-Tc superconductors, supporting the d-wave pairing symmetry hypothesis.
Contribution
It provides the first experimental evidence of anomalous periodicity in the CPR of YBCO junctions, confirming theoretical predictions about d-wave symmetry.
Findings
Half-fluxon periodicity observed in YBCO junctions
Evidence supporting d-wave pairing symmetry in cuprates
Novel use of single-junction interferometer for CPR measurement
Abstract
The current-phase relation (CPR) for asymmetric 45 degree Josephson junctions between two d-wave superconductors has been predicted to exhibit an anomalous periodicity. We have used the single-junction interferometer to investigate the CPR for this kind of junctions in YBCO thin films. Half-fluxon periodicity has been experimentally found, providing a novel source of evidence for the d-wave symmetry of the pairing state of the cuprates.
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