89Y NMR study of the effects of impurities on and between the CuO2 planes in high-Tc superconducting cuprates
G. V. M. Williams, J. L. Tallon
DOI 10.1103/PhysRevB.57.10984 · Physical Review B
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Abstract
We have performed 89Y NMR, susceptibility and thermoelectric power measurements on the Y1−xCaxBa2−xLaxCu4O8 superconductor to investigate the effects of impurities between the superconducting CuO2 planes. The results are compared with Zn and Ni impurities in YBa2Cu4O8 that substitute primarily for Cu within each superconducting CuO2 plane. Interplanar impurities result in negligible pair breaking while intraplanar impurities lead to a rapid depression in Tc. This is consistent with two-dimensional superconductivity within each CuO2 plane and weak interplanar coupling. The Ca, La, Zn, and Ni impurities all lead to similar increases in the 89Y NMR linewidth at 293 K with increasing impurity concentration indicating, contrary to previous reports, that an induced local moment is not responsible for the linewidth increase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1-xCaxBa2-xLaxCu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| YBa2Cu4-zZnzO8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu4-zNizO8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Y1-xCaxBa2Cu3O7 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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