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- W239398386 abstract "Pulsed KrF (248 nm) excimer laser ablation has been used to grow nonsymmetric epitaxial YBCO/PrBCO superlattices containing 1-, 2-, 3-, 4-, and 8-unit-cell-thick YBCO layers, separated by N-cell-thick insulating PrBCO layers (N = 1 {minus} 16). The 1 {times} N and 2 {times} N structures exhibit a rapid initial decrease of T{sub co} with increasing PrBCO layer thickness, followed by saturation of T{sub co} at a nonzero value, as the YBCO layer's separation is increased further. The limiting T{sub co} values for 1-, 2-, 3-, 4-, and 8-cell-thick YBCO layers isolated in a PrBCO matrix are {approximately}19 K {approximately}54 K, {approximately}71 K, {approximately}87 K , respectively. Single-cell-thick YBCO layers are found to be superconducting even when separated by {approximately}19 nm in a PrBCO matrix. These results are discussed in terms of possible Josephson and/or proximity effects coupling the YBCO layers, and the possibility that PrBCO modifies the electronic structure and depresses T{sub co} in YBCO cells that are immediately adjacent to the PrBCO layers. Finally, high-temperature post-annealing studies show that these superlattice structures are stable and that little diffusion occurs along the c-axis direction of compositional modulation. 14 refs., 3 figs." @default.
- W239398386 created "2016-06-24" @default.
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- W239398386 date "1990-04-01" @default.
- W239398386 modified "2023-09-26" @default.
- W239398386 title "Superconductivity in nonsymmetric epitaxial YBa sub 2 Cu sub 3 O sub 7-. delta. -PrBa sub 2 Cu sub 3 O sub 7-. delta. superlattices grown by pulsed laser ablation" @default.
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