Effect of oxygen pressure on the orthorhombic-tetragonal transition in the high-temperature superconductor YBa2Cu3Ox
E. D. Specht, C. J. Sparks, A. G. Dhere, J. Brynestad, O. B. Cavin, D. M. Kroeger, H. A. Oye
DOI 10.1103/PhysRevB.37.7426 · Physical Review B
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Abstract
High-resolution in situ x-ray-diffraction measurements were made of the lattice constants of YBa2Cu3Ox as it was heated and cooled through the orthorhombic-tetragonal transition at a series of O2 pressures. The transition is sharp, continuous, and reversible in temperature and pressure. As O2 pressure is reduced from 1.0 to 0.005 atm, the transition temperature falls from 676±5 °C to 521±10 °C while oxygen content at the transition falls from 6.66±0.01 to 6.59±0.02. Dilation along the c axis is observed as oxygen is removed. Under helium, an irreversible but time-dependent orthorhombic-to-tetragonal transition occurs during heating.
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. | 92 | Pressure not reported | unknown |
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