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Related Experiment Videos

A-Axis--Oriented YBa2Cu3O7/PrBa2Cu3O7 Superlattices.

C B Eom, A F Marshall, J M Triscone

    Science (New York, N.Y.)
    |February 15, 1991
    PubMed
    Summary
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    Researchers created a novel modulated structure using high transition temperature superconductors. This design, featuring alternating superconducting and insulating strips, enables quasi-one-dimensional conductivity.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Superconductivity

    Background:

    • High transition temperature superconductors (HTS) offer potential for advanced electronic applications.
    • Tailoring the structure of HTS materials is crucial for controlling their electronic properties.
    • Previous research has explored layered HTS structures, but achieving modulated planes with distinct superconducting and insulating regions presents unique challenges.

    Purpose of the Study:

    • To fabricate a novel modulated superconductor structure with alternating superconducting and insulating strips within individual CuO(2) planes.
    • To investigate the structural characteristics and crystalline perfection of the fabricated superlattices.
    • To assess the potential for achieving quasi-one-dimensional conductivity in these engineered HTS structures.

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    Main Methods:

    • Fabrication of a-axis-oriented YBa(2)Cu(3)O(7)/PrBa(2)Cu(3)O(7) superlattices using 90-degree off-axis sputtering.
    • Growth on (100)SrTiO(3) and (100)LaAlO(3) substrates.
    • Characterization using X-ray diffraction (XRD), cross-sectional transmission electron microscopy (TEM), and Rutherford backscattering spectroscopy (RBS).

    Main Results:

    • Successful fabrication of superlattices with a modulation wavelength of 24 angstroms (12 angstroms YBa(2)Cu(3)O(7)/12 angstroms PrBa(2)Cu(3)O(7)).
    • Confirmation of superlattice modulation via XRD and cross-sectional TEM.
    • High crystalline perfection demonstrated by RBS, with a channeling minimum yield of 3 percent.

    Conclusions:

    • The fabricated modulated superconductor structure successfully integrates alternating superconducting and insulating regions.
    • The observed structural integrity and high crystalline perfection are promising for advanced electronic devices.
    • These engineered superlattices hold significant potential for realizing quasi-one-dimensional conductivity.