Josephson effect in the unusual superconductors Lu2Fe3Si5, LiTi2O4, and UBe13

E. L. Wolf, R. J. Noer, S. Han, K. W. Ng, T. P. Chen, D. K. Finnemore, L. Tanner

Research output: Contribution to journalArticle

Abstract

A Josephson supercurrent, which can be split by microwave photons of frequency ν into Shapiro steps of spacing ΔV = hν/2e, is expected between superconductors of like pairing type, either s- or p-wave. A weaker, and possibly unobservable effect, with step spacing Δ V 2 was predicted by Pals and van Haeringen between electrodes of unlike pairing type. Experiments using K-band microwaves and a Nb point contact have been carried out at 1.2 K on the d-band superconductors LiTi2O4 and Lu2Fe3Si5. In both cases we find unambiguous indication of s-wave pairing, as in Nb. The same experiment on the heavy-fermion superconductor UBe13 in the range 0.7-7 K also reveals steps of spacing ΔV. This indicates that UBe13 has been induced into a state of s-wave superconductivity by proximity with the s-wave superconductors Nb.

Original languageEnglish (US)
Pages (from-to)65-68
Number of pages4
JournalPhysica B+C
Volume135
Issue number1-3
DOIs
StatePublished - Dec 2 1985

ASJC Scopus subject areas

  • Engineering(all)

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