Lattice effects observed by the isotope-difference pair density function of the YBa263/65Cu3O6.92 superconductor
Despina Louca, G. H. Kwei, B. Dabrowski, Z. Bukowski
DOI 10.1103/PhysRevB.60.7558 · Physical Review B
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Abstract
The local lattice effects in the YBa2Cu3O6.92 superconductor were characterized by the neutron differential pair density function (DPDF) analysis. The DPDF provides an atom specific PDF, enabling the distinction between overlapping atom pair correlations in complicated systems. It utilizes the contrast in the scattering amplitude enhanced by the different neutron scattering lengths for 63Cu and 65Cu in two isotopically pure samples with identical compositions. Significant structural distortions are observed in the superconducting planes, in association with the plane copper (Cu2). A bifurcation of the Cu2 to apical oxygen (O4) pair correlations is evident which is temperature dependent. This effect originates from distortions along the c axis of the crystal of the Cu2 ions and not of the O4, as no distortions are observed in association with the connecting pair, the Cu1 (chain)-O4. Secondary lattice anharmonicities in the chains are also seen, arising mostly from defects in the vicinity of oxygen vacancies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | onset |
| YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | onset |
| 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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