Local structure around F in the fluorine-doped Nd2CuO4 superconductor
A. Krol, Y. L. Soo, Z. H. Ming, S. Huang, Y. H. Kao, G. C. Smith, K. Lee, A. C. W. P. James, D. W. Murphy
DOI 10.1103/PhysRevB.46.443 · Physical Review B
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Abstract
Soft-x-ray-absorption fine-structure (XAFS) measurements were performed at the F K edge on Nd2CuO4−xFx compounds with x=0.15 and 0.30. It is found that a majority of F atoms substitute for the O(2) sites in fluorite-type NdO layers between CuO2 sheets. For the compositions x=0.15 and 0.30, a fraction of 0.33±0.15 and 0.39±0.14 of F dopants, respectively, substitute for the O(1) site in the CuO2 planes. Fluorine anions placed at the O(2) sites in the NdO layers form a reservoir of extra electrons for the superconducting CuO2 sheets in Nd2CuO4−xFx superconductors, analogous to the substitution of Ce or Th cations for Nd. This observation thus provides evidence for a symmetry of anionic (F) and cationic (Ce and Th) substitution in the NdO layers in connection with superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2CuO4-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
| Nd2CuO4-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | zero_resistance |
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