Failure of the charge-transfer hypothesis for superconductivity in YBa{sub 2}Cu{sub 3}O{sub x} and in La{sub 2{minus}{beta}}Sr{sub {beta}}CuO{sub 4}
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
- Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287-1504 (United States)
By extracting the layer-charges in YBa{sub 2}Cu{sub 3}O{sub x} as functions of dopant oxygen content x from neutron diffraction data (using the bond-valence-sum method), we show that the charge-transfer hypothesis of high-temperature cuprate-plane superconductivity fails to describe the data. A similar failure occurs for La{sub 2{minus}{beta}}Sr{sub {beta}}CuO{sub 4} as a function of Sr dopant concentration, and was implicitly predicted (before the charge-transfer hypothesis was enunciated) by self-consistent local-density-approximation calculations of R. V. Kasowski, M.-H. Tsai, J. D. Dow, and M. T. Czyzyk [Physica C {bold 162}, 1349 (1989)]. Both failures can be traced to difficulties the hypothesis has with (i) the rules of chemistry which require electronegative dopants such as oxygen to attract electrons, not holes, and (ii) the law of conservation of (neutral) charge in each unit cell. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Purdue Research Foundation
- DOE Contract Number:
- FG02-90ER45427
- OSTI ID:
- 496658
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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