Charge-transfer in YBa2Cu3Ox |
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Authors: | Howard A. Blackstead and John D. Dow |
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Affiliation: | (1) Department of Physics, University of Notre Dame, 46556 Notre Dame, Indiana, USA;(2) Department of Physics and Astronomy, Arizona State University, 85287-1504 Tempe, Arizona, USA |
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Abstract: | The charge-transfer hypothesis is shown to be inconsistent with data for YBa2Cu3Ox: (i) The two-step behavior ofTc(x) (with jumps from zero to 60 K and then to 90 K) is not reflected as a similar, statistically significant two-step behavior in the bond-valence-sum charge of cuprate-plane Cu ions (as once believed), (ii) as a consequence of the law of conservation of charge, the derivatives of the layer charges with respect to oxygen contentx for both the Ba-O layers and the charge-reservoir Cu-O chains have the opposite signs to those predicted, and (iii) the charge-transfer observed for superconducting YBa2Cu3Ox is not sufficient to produce superconductivity, as demonstrated by insulating PrBa2Cu3Ox, which has virtually the same layer charges. |
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Keywords: | Superconductivity charge transfer YBa2Cu3Ox |
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