Oxygen intercalation in the perovskite superconductor YBa2Cu3O6+x
W. R. McKinnon, M. L. Post, L. S. Selwyn, G. Pleizier, J. M. Tarascon, P. Barboux, L. H. Greene, G. W. Hull
DOI 10.1103/PhysRevB.38.6543 · Physical Review B
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Abstract
We have studied superconductivity and the thermodynamics of oxygen insertion in the oxygen intercalation system YBa2Cu3O6+x. The superconducting transition temperature decreases as x decreases, and the transition is sharp at Tc=90 K near x=1 and at 55 K near x=0.5. The thermodynamics of oxygen intercalation at high temperatures (both isotherms and isobars), and the orthorhombic-tetragonal transition, can be explained in terms of a lattice-gas model that includes a large energy of repulsion between oxygen atoms on nearest-neighbor sites. The high-temperature behavior is also consistent with smaller interactions, some attractive, between second neighbors. Such energies are needed to explain the behavior at low temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
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