Unusual pressure evolution of the Meissner and Josephson effects in the heavy-fermion superconductor UPt3
Jun Gouchi, Akihiko Sumiyama, Akira Yamaguchi, Gaku Motoyama, Noriaki Kimura, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Ōnuki
DOI 10.1103/PhysRevB.93.174514 · Physical Review B
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Abstract
The Josephson effect between a single-crystal UPt3 and a conventional superconductor Al has been investigated under pressure for the junction on the UPt3 surface perpendicular to the hexagonal c[0001] axis. Simultaneously measured magnetization has revealed that the Meissner fraction approaches a minimum value of ∼1% at the critical pressure of Pc∼0.4GPa. The critical temperature Tc and the temperature TJ where a measurable Josephson critical current Ic first appears decrease with increasing pressure; the decreasing rate of |dTc/dP| is almost constant, whereas |dTJ/dP| shows an abrupt increase above Pc, indicating that the Josephson effect is suppressed above Pc. These results, together with the decrease in penetration depth λ derived from the magnetic-field dependence of Ic, suggest that the superconducting phase is modified above Pc by the disappearance of the symmetry-breaking antiferromagnetic order.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.58 | Pressure unresolved | onset |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.52 | Pressure unresolved | onset |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.58 | 0.13 GPa | midpoint |
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