Evidence for an unconventional superconducting order parameter in YBa2Cu3O6.9
D. A. Brawner, H. R. Ott
DOI 10.1103/PhysRevB.50.6530 · Physical Review B
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Abstract
We report measurements of the dynamic resistance RD of a dc SQUID formed by two contacts between two different edges of a single crystal of YBa2Cu3O6.9 and a Nb block. The phase of the field-induced RD oscillations was compared with those of two adjacent SQUID’s, each formed by two Nb-Nb contacts. We find a phase difference of 160±30° between the oscillations of the composite SQUID and those of the SQUID’s formed by Nb-Nb junctions. A possible explanation for this reproducible effect is that this cuprate superconductor has an unconventional order parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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