Abstract
We report the crystal chemical properties of solid solutions obtained by substitution of lanthanum for barium in the high-Tc superconductor Ba2YCu3O7. An orthorhombic-to-tetragonal symmetry change occurs at x=0.4 in Ba2-xLaxYCu3O7±δ with the tripled perovskite supercell maintained. Charge compensation is achieved through reduction of the formal copper valence (δ=0) in the orthorhombic phase and by a mixture of excess oxygen accommodation (δ>0) and formal valence reduction in the tetragonal phase. The resistivity increases by several orders of magnitude, even though the average formal copper valence changes very little.
Original language | English (US) |
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Pages (from-to) | 5912-5915 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 37 |
Issue number | 10 |
DOIs | |
State | Published - 1988 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics