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 journalArticlepeer-review

5 Scopus citations

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

Bibliographical note

Funding Information:
* Permanent address: Carleton College, Northfield, MN 55057, USA. ** Lawrence Laboratory, Livermore, CA 94550, USA. * Operated for the USDOE by Iowa State University under contract No. W-7405-Eng-82. This work was supported by the Director for Energy Research, Office of Basic Energy Science.

ASJC Scopus subject areas

  • Engineering (all)

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