TY - JOUR
T1 - Control of Composition and Microstructure in High-Temperature Superconductors at the Atomic Level by Molecular Beam Epitaxy
AU - Eckstein, J. N.
AU - Bozovic, I.
AU - Klausmeier-Brown, M. E.
AU - Virshup, G. F.
AU - Ralls, K. S.
PY - 1992/8
Y1 - 1992/8
N2 - With accurate control of the ALL-MBE process, films with intrinsic and bulklike superconductive properties can be synthesized. The reaction coordinate for the growth of each molecular layer can be monitored by RHEED, revealing details of the chemical intermediate states occurring in real time. Furthermore, by utilizing such kinetic control, distinct reaction coordinate paths can be chosen. Complex heterostructures can be grown, where each molecular layer exhibits near-intrinsic superconductive properties, allowing meaningful study of superconductive transport in engineered multilayers. In particular, these experiments have provided evidence that the fundamental superconductive state is two-dimensional. By using this technique to construct trilayers with metastable and doped barriers, Josephson junctions with low residual current and sharp I-V features have been fabricated. Furthermore, by doping with a variety of trivalent cations on the divalent Ca sites, a tuning of over three orders of magnitude in Ic and Rn with constant IcRn voltage was obtained, indicating that transport through the available elastic channels was systematically engineered.
AB - With accurate control of the ALL-MBE process, films with intrinsic and bulklike superconductive properties can be synthesized. The reaction coordinate for the growth of each molecular layer can be monitored by RHEED, revealing details of the chemical intermediate states occurring in real time. Furthermore, by utilizing such kinetic control, distinct reaction coordinate paths can be chosen. Complex heterostructures can be grown, where each molecular layer exhibits near-intrinsic superconductive properties, allowing meaningful study of superconductive transport in engineered multilayers. In particular, these experiments have provided evidence that the fundamental superconductive state is two-dimensional. By using this technique to construct trilayers with metastable and doped barriers, Josephson junctions with low residual current and sharp I-V features have been fabricated. Furthermore, by doping with a variety of trivalent cations on the divalent Ca sites, a tuning of over three orders of magnitude in Ic and Rn with constant IcRn voltage was obtained, indicating that transport through the available elastic channels was systematically engineered.
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U2 - 10.1557/S0883769400041828
DO - 10.1557/S0883769400041828
M3 - Article
AN - SCOPUS:84971995948
SN - 0883-7694
VL - 17
SP - 27
EP - 33
JO - MRS Bulletin
JF - MRS Bulletin
IS - 8
ER -