Small-angle neutron scattering study of the flux-line lattice in a single crystal of Bi2.15Sr1.95CaCu2O8+x

M. Yethiraj, H.A. Mook, E.M. Forgan, R. Cubitt, M.T. Wylie, D.M. Paul, S.L. Lee, J. Ricketts, P.H. Kes, Kell Mortensen

    Research output: Contribution to journalConference articleResearch

    Abstract

    A flux‐line lattice (FLL) was observed in a single crystal of Bi2.15Sr1.95CaCu2O8+x (BSCCO) using small‐angle neutron scattering methods. The sample has a superconducting transition at 85 K. The flux‐line lattice is observed to melt, evidenced by the rapid disappearance of diffracted intensity as the temperature is increased above a field‐dependent melting temperature. Diffracted intensity due to the vortex lattice also falls off as the applied field is increased. It is believed that this is a manifestation of the transition of the three‐dimensional flux lines into two‐dimensional pancake vortices. The Bragg intensity of the FLL peak is inversely proportional to the fourth power of the London penetration depth (λL). Hence, the temperature (T) dependence of the order parameter can be measured quite accurately from the intensity of the Bragg spots at different temperatures. In BSCCO with an applied field of 50 mT, the measured T dependence appears linear. The low‐T behavior is of great interest for an understanding of the underlying mechanism for superconductivity in these materials.
    Original languageEnglish
    JournalJournal of Applied Physics
    Volume76
    Issue number10
    Pages (from-to)6784-6787
    ISSN0021-8979
    DOIs
    Publication statusPublished - 1994
    Event6th Joint Magnetism and Magnetic Materials-Intermag Conference - Albuquerque, NM, United States
    Duration: 20 Jun 199430 Jun 1994
    Conference number: 6

    Conference

    Conference6th Joint Magnetism and Magnetic Materials-Intermag Conference
    Number6
    CountryUnited States
    CityAlbuquerque, NM
    Period20/06/199430/06/1994

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