Image simulations of kinked vortices for transmission electron microscopy

Marco Beleggia, G. Pozzi, A. Tonomura

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We present an improved model of kinked vortices in high-Tc superconductors suitable for the interpretation of Fresnel or holographic observations carried out with a transmission electron microscope. A kinked vortex is composed of two displaced half-vortices, perpendicular to the film plane, connected by a horizontal flux-line in the plane, resembling a connecting Josephson vortex (JV) segment. Such structures may arise when a magnetic field is applied almost in the plane, and the line tension of the fluxon breaks down under its influence. The existence of kinked vortices was hinted in earlier observations of high-Tc superconducting films, where the Fresnel contrast associated with some vortices showed a dumbbell like appearance. Here, we show that under suitable conditions the JV segment may reveal itself in Fresnel imaging or holographic phase mapping in a transmission electron microscope.
    Original languageEnglish
    JournalULTRAMICROSCOPY
    Volume110
    Issue number11
    Pages (from-to)1428-1433
    Number of pages6
    ISSN0304-3991
    DOIs
    Publication statusPublished - 2010

    Keywords

    • High-Tc superconductors
    • Transmission electron microscopy
    • Josephson vortices
    • Electron-optical phase shift
    • Electron holography
    • Lorentz microscopy

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