Abstract
In systematic studies of oxygen-deficient Ba2YCu3O7-δ, we have found that a structural anomaly occurs at the composition where bulk superconductivity disappears. The observed step-like increase in the c lattice parameter, when associated with changes in the atomic positions within the unit cell, indicates that superconductivity is lost due to a charge redistribution from the copper-oxygen chains to the copper-oxygen planes. This is microscopic experimental evidence establishing the role of secondary structural elements in the layered copper-oxide high-Tc superconductors.
Original language | English (US) |
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Pages (from-to) | 523-527 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 156 |
Issue number | 4 |
DOIs | |
State | Published - Nov 1 1988 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering