Anisotropy of the Josephson Critical Current between UPt3 and Nb

A. Sumiyama; S. Shibata; Y. Oda; N. Kimura; E. Yamamoto; Y. Haga; Y. O¯nuki

doi:10.1103/PhysRevLett.81.5213

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Anisotropy of the Josephson Critical Current between UPt3 and Nb

A. Sumiyama, S. Shibata, Y. Oda, N. Kimura, E. Yamamoto, Y. Haga, Y. O¯nuki

DOI 10.1103/PhysRevLett.81.5213 · Physical Review Letters

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Abstract

Josephson critical current densities Jc between a single crystal UPt3 and an s-wave superconductor have been investigated for UPt3−Cu−Nb junctions and UPt3−Nb junctions. The anisotropic temperature dependence is observed at about the lower critical temperature Tc− of UPt3; the increase in Jc with decreasing temperatures becomes fast below Tc− for a current flow parallel to the crystallographic c axis and it becomes rather slow below Tc− for a current flow parallel to the b axis. This anisotropy gives clear evidence that the Josephson effect reflects the anisotropic superconductivity of UPt3.

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 not reported	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.53	Pressure not reported	midpoint
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.54	Pressure not reported	onset
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown