Epitaxial growth and superconducting anisotropy of PbSr2Y1−xCaxCu2O7+δ thin films
S. Komori, R. Inaba, K. Kaneko, S. Fujita, I. Kakeya, M. Suzuki
DOI 10.1103/PhysRevB.89.174509 · Physical Review B
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Abstract
Thin films of single-crystal Pb1−yBiySr2Y1−xCaxCu2O7+δ (PbBi1212) were grown on SrTiO3 (100) substrates by a two-step growth technique in which an amorphous film is annealed at 970 ∘C in a closed ceramic container prepared using the same material as the film. We find that PbBi1212 exhibits superconductivity when the Ca concentration x exceeds 0.3. The effective number of holes per Cu atom neff is well described as neff=0.34x. The highest onset temperature for the superconducting transition attained in the present study is 65 K. The resistivity measurement in a magnetic field reveals that the coherence lengths of Pb1212 (y=0) are approximately 25 and 2.7 Å along the ab plane and the c axis, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbSr2Y1-xCaxCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | onset |
| Pb1-yBiySr2Y1-xCaxCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| PbSr2CaCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlBa2CaCu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
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