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

doi:10.1016/0378-4363(85)90436-X

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 journal › Article › peer-review

6 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 language	English
Pages (from-to)	65-68
Number of pages	4
Journal	Physica B+C
Volume	135
Issue number	1-3
DOIs	https://doi.org/10.1016/0378-4363(85)90436-X
State	Published - 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

General Engineering

Access to Document

10.1016/0378-4363(85)90436-X

Cite this

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title = "Josephson effect in the unusual superconductors Lu2Fe3Si5, LiTi2O4, and UBe13",

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.",

author = "Wolf, {E. L.} and Noer, {R. J.} and S. Han and Ng, {K. W.} and Chen, {T. P.} and Finnemore, {D. K.} and L. Tanner",

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.",

year = "1985",

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doi = "10.1016/0378-4363(85)90436-X",

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AU - Wolf, E. L.

AU - Noer, R. J.

AU - Han, S.

AU - Ng, K. W.

AU - Chen, T. P.

AU - Finnemore, D. K.

AU - Tanner, L.

N1 - 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.

PY - 1985/12/2

Y1 - 1985/12/2

N2 - 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.

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