c-axis thermal expansion of the Tl2Ba2CaCu2Ox superconductor
E. F. Skelton, W. T. Elam, M. S. Osofsky, P. Lubitz, M. Z. Harford, A. K. Singh
DOI 10.1103/PhysRevB.39.2779 · Physical Review B
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Abstract
The low-temperature c-axis thermal expansion of a thin-film sample of the superconducting material Tl2Ba2CaCu2Ox was measured to 10 K. Based on standard ac resistance measurements, the material exhibits a detectable drop at 110 K and zero resistance at 78 K. Careful x-ray measurements between 10 and 300 K reveal a uniform, monotonic c-axis expansion of about 0.4%, similar to what has been previously found for La1.9Ba0.1CuO4 and YBa2Cu3O7. Although anomalous c-axis thermal expansion has been recently reported in YBa2Cu3O7−δ, a careful search in the vicinity of Tc failed to reveal anything unusual in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | zero_resistance |
| La1.9Ba0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 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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