Observation of Negative s-Wave Proximity Effect in Superconducting UBe13

Siyuan Han; K. W. Ng; E. L. Wolf; Andrew Millis; J. L. Smith; Zachary Fisk

doi:10.1103/PhysRevLett.57.238

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Observation of Negative s-Wave Proximity Effect in Superconducting UBe13

Siyuan Han, K. W. Ng, E. L. Wolf, Andrew Millis, J. L. Smith, Zachary Fisk

DOI 10.1103/PhysRevLett.57.238 · Physical Review Letters

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Abstract

The Josephson Ic between a Ta-wire probe and an induced, surface, singlet, superconducting state in UBe13 decreases with decreasing temperature below the bulk UBe13 Tc, in contrast to the increase seen in comparison Mo samples. This shows that the bulk UBe13 superconductivity suppresses the induced singlet superconductivity. Such suppression is evidence of a triplet super-conducting state in UBe13. Evidence is presented for phase slip between weakly coupled singlet and triplet order parameters.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.86	Pressure not reported	unknown
Mo Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.92	Pressure not reported	unknown
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.47	Pressure not reported	unknown