Superconducting and nonsuperconducting phases of YBa2Cu3Ox: Modifications at the high-temperature phase transition
L. R. Testardi, W. G. Moulton, H. Mathias, H. K. Ng, C. M. Rey, R. J. Kennedy
DOI 10.1103/PhysRevB.36.8816 · Physical Review B
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Abstract
A phase transition starting at 900°C has recently been found to be a necessary precursor to the high-Tc superconductivity in YBa2Cu3Ox. We report here that the phase change involves an insulator (T>900°C phase) to metal transformation. Specific-heat measurements show that both phases have comparable Debye temperatures, and, unexpectedly, linear T terms at low temperature. For the insulating phase, this term is comparable to that in a transition metal. The insulating phase also has an electrical resistivity of the unusual form ρ∝e−TTa below 300 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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