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 conferencePaper

Abstract

A Josephson supercurrent, which can be split by microwave photons of frequency v into Shapiro steps of spacing TRIAN OP V equals hv/2e, is expected between superconductors of like pairing type, either s- or p-wave. A weaker, and possibly unobservable effect, with step spacing TRIAN OP 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 LiTi//2O//4 and Lu//2Fe//3Si//5. In both cases we find unambiguous indication of s-wave pairing, as in Nb. The same experiment on the heavy-fermion superconductor UBe//1//3 in the range 0. 7-7 K also reveals steps of spacing TRIAN OP V. This indicates that UBe//1//3 has been induced into a state of s-wave superconductivity by proximity with the s-wave superconductor Nb.

Original languageEnglish (US)
Pages65-68
Number of pages4
StatePublished - Jan 1 1985

ASJC Scopus subject areas

  • Engineering(all)

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    Wolf, E. L., Noer, R. J., Han, S., Ng, K. W., Chen, T. P., Finnemore, D. K., & Tanner, L. (1985). JOSEPHSON EFFECT IN THE UNUSUAL SUPERCONDUCTORS Lu2Fe3Si5, LiTi2O4, and UBe13.. 65-68.