Josephson effect in the unusual superconductors Lu2Fe3Si5, LiTi2O4 and UBe13
Abstract
A Josephson supercurrent, which can be split by microwave photons of frequency nu into Shapiro steps of spacing (DELTA) V = hnu/2e, is expected between superconductors of like pairing type, either s or p-wave. A weaker, and possibly unobservable effect, with step spacing (DELTA)V/2 was predicted by Pals and van Haeringen between electrons 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 UBe13 has been induced into a state of s-wave superconductivity by proximity with the s-wave superconductor Nb.
- Publication:
-
Presented at the Mater. and Mech. of Superconductivity Conf
- Pub Date:
- 1985
- Bibcode:
- 1985mmsc.conf.....W
- Keywords:
-
- Josephson Junctions;
- Microwaves;
- Superconductivity;
- Superconductors;
- Lithium Compounds;
- Low Temperature;
- P Waves;
- Photons;
- S Waves;
- Titanates;
- Solid-State Physics