Experimental Evidence for Intra- and Inter-Unit-Cell Josephson Junctions in a YBa2Cu3O 7−δ Single Crystal
D. C. Ling, Grace Yong, J. T. Chen, L. E. Wenger
DOI 10.1103/PhysRevLett.75.2011 · Physical Review Letters
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Abstract
Modulation of the dynamic resistance versus the magnetic field of YBa2Cu3O7−δ single crystal shows two groups of peak structures with nearly uniform magnetic field spacings. The spacings suggest two kinds of Josephson junctions: one formed by the CuO2-Y-CuO2 atomic planes within each unit cell and the other formed by the CuO2 bilayers between different unit cells. The intra-unit-cell junctions appear first as the temperature is lowered from Tc. The existence of CuO2-Y-CuO2 Josephson junctions implies two-dimensional superconductivity in the CuO2 atomic planes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ 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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