Extended x-ray-absorption fine-structure experiment on the high-Tc superconductor YBa2Cu3O7−δ
Ke Zhang, G. B. Bunker, G. Zhang, Z. X. Zhao, L. Q. Chen, Y. Z. Huang
DOI 10.1103/PhysRevB.37.3375 · Physical Review B
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Abstract
X-ray-absorption spectroscopy has been used to study the high-Tc superconductor YBa2Cu3O7 on all three metal elements. The structure determined is consistent with diffraction results, except for some slight differences. Analysis of the yttrium K-edge x-ray-absorption fine-structure (EXAFS) experiment suggested that the Y-O distance split further into two distances at 80 K. The temperature dependence of the Cu-O bond strength indicated that the system below Tc is more disordered than an Einstein model predicted. The bond strengths determined by the temperature dependence of the EXAFS Debye-Waller factor showed clearly that the Cu(2) planes are strongly coupled with each other through yttrium-oxygen bonds, and are weakly coupled to the other planes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ 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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