Phase diagram of the superconducting oxide YBa2Cu3O6+δ
A. G. Khachaturyan, S. V. Semenovskaya, J. W. Morris, Jr.
DOI 10.1103/PhysRevB.37.2243 · Physical Review B
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Abstract
The superconducting oxide YBa2Cu3O6+δ is found in two structures: a tetragonal structure (T) that is stoichiometric when δ=0, and an orthorhombic (O) structure stoichiometric when δ=1. Assuming that only these phases appear in the phase diagram of the oxide as temperature (t) and δ are varied, it is shown that the phase diagram must have one of two relatively simple forms. The first has a T field at high t and low δ, an O field at lower temperature and high δ, and a T+O two-phase field that separates the two at low t. The second has these features, and also includes an O+O’ two-phase field that results from a miscibility gap in the O phase. A mean-field model is fit to the experimental data, and suggests that the second type of diagram is correct. The calculated phase diagram is presented. The variation of the oxygen partial pressure with δ and t is also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6+δ 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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