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Author Sarrao, J. L. ♦ Young, D. P. ♦ Fisk, Z. ♦ Moshopoulou, E. G. ♦ Thompson, J. D. ♦ Chakoumakos, B. C. ♦ Nagler, S. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ LANTHANUM OXIDES ♦ PHYSICAL PROPERTIES ♦ COPPER OXIDES ♦ LITHIUM OXIDES ♦ QUATERNARY COMPOUNDS ♦ CRYSTAL STRUCTURE ♦ PHASE TRANSFORMATIONS ♦ MAGNETIC PROPERTIES ♦ ELECTRIC CONDUCTIVITY ♦ SUBSTITUTION
Abstract Li substitutes for Cu in La{sub 2}CuO{sub 4} up to the limiting stoichiometry La{sub 2}Cu{sub 0.5}Li{sub 0.5}O{sub 4}, which has superstructure order. The effects of this in-plane hole doping on the structural and magnetic properties of La{sub 2}CuO{sub 4} are very similar to those due to Sr substitution. The tetragonal-orthorhombic structural phase transition occurs, for a given amount of Sr or Li, at nearly the same temperature, and the in-plane lattice constant of La{sub 2{minus}{ital y}}Sr{sub {ital y}}Cu{sub 1{minus}{ital x}}Li{sub {ital x}}O{sub 4} at room temperature depends only on the combined hole count ({ital x}+{ital y}) and not on the individual Sr or Li concentration. Long-range magnetic order is destroyed upon substituting 3{percent} Li for Cu, analogous to the effect of Sr substitution on {ital T}{sub N{acute e}el}. However, the holes introduced by Li substitution are bound. The resistivity as a function of temperature is nonmetallic for all Li concentrations. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Department Oak Ridge National Laboratory
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 17
Organization Oak Ridge National Laboratory


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