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- W1999356243 abstract "The effect of magnetic impurities between the two planes of a CuO{sub 2} bilayer on the superconducting properties is considered. To this end a previously introduced model for a CuO{sub 2} bilayer with finite lateral size {ital L} is used. This system undergoes a bona fide transition (crossover) from two-dimensional to zero-dimensional behavior as the temperature decreases below a size-dependent value {ital T}{sub {ital c}}{sup *}. The model is an attempt to explain experimental findings on YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}/Bi{sub 2}Sr{sub 2}CuO{sub 6} superlattices which seem to indicate that a single CuO{sub 2} bilayer can still exhibit superconducting behavior. {ital T}{sub {ital c}}{sup *} is found to decrease with increasing impurity concentration. This could be a hint at the microscopic origin of the measured {ital T}{sub {ital c}} depression in Tl{sub 2{minus}{ital x}}Sm{sub {ital x}}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}} with increasing {ital x}. The recently discovered paramagnetic Meissner effect cannot be described by the CuO{sub 2} bilayer model with magnetic impurities, although the Josephson term in the free-energy functional changes sign for sufficiently high impurity concentration, i.e., the bilayer behaves like a {pi} junction." @default.
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- W1999356243 date "1995-05-01" @default.
- W1999356243 modified "2023-09-26" @default.
- W1999356243 title "CuO2bilayer containing magnetic impurities" @default.
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- W1999356243 doi "https://doi.org/10.1103/physrevb.51.11988" @default.
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