Structure of the high-Tc superconductor Ba2YCu3O7+x above (124 K) and below (71 K) Tc by neutron diffraction
Q. W. Yan, P. L. Zhang, Z. G. Shen, J. K. Zhao, Y. Ren, Y. N. Wei, T. D. Mao, C. X. Liu, T. S. Ning, K. Sun, Q. S. Yang
DOI 10.1103/PhysRevB.36.8810 · Physical Review B
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Abstract
The crystal structure of the high-Tc superconductor Ba2YCu3O7+x at 124 and 71 K was refined by Rietveld analysis of neutron-diffraction data. We found that at 124 and 71 K the structure is of the same space group Pmmm, but when the temperature is decreased and passes the critical temperature Tc, 0.12 of the oxygen population on the 1e site transfers to the 1b site. This remarkable change in the structure can be related to its superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | onset |
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