EVIDENCE FOR UNCONVENTIONAL SUPERCONDUCTIVITY IN YBA2CU3O6.9

Authors
BRAWNER DA OTT HR
Citation
Da. Brawner et Hr. Ott, EVIDENCE FOR UNCONVENTIONAL SUPERCONDUCTIVITY IN YBA2CU3O6.9, Physica. C, Superconductivity, 235, 1994, pp. 1867-1868
Citations number
6
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
235
Year of publication
1994
Part
3
Pages
1867 - 1868
Database
ISI
SICI code
0921-4534(1994)235:<1867:EFUSIY>2.0.ZU;2-Y
Abstract
We report measurements of the dynamic resistance of a de-SQUID formed by two contacts between two different edges of a single crystal of YBa 2Cu3O6.9 and a Nb block. The phase of the field induced RD oscillation s was compared with those of two adjacent SQUIDs, each formed by two N b-Nb contacts. We find a phase difference of 160+/-30 degrees between the oscillations of the composite SQUID and those of the SQUIDs formed by Nb-Nb junctions. A possible explanation for this reproducible effe ct is that the cuprate superconductor has an unconventional order para meter.