Abstract
The Josephson effect between a single-crystal and a conventional superconductor Al has been investigated under pressure for the junction on the surface perpendicular to the hexagonal axis. Simultaneously measured magnetization has revealed that the Meissner fraction approaches a minimum value of at the critical pressure of . The critical temperature and the temperature where a measurable Josephson critical current first appears decrease with increasing pressure; the decreasing rate of is almost constant, whereas shows an abrupt increase above , indicating that the Josephson effect is suppressed above . These results, together with the decrease in penetration depth derived from the magnetic-field dependence of , suggest that the superconducting phase is modified above by the disappearance of the symmetry-breaking antiferromagnetic order.
- Received 15 December 2015
- Revised 14 March 2016
DOI:https://doi.org/10.1103/PhysRevB.93.174514
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