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Magnetization measurements and Ginzburg-Landau simulations of micron-size β-tin samples: evidence for an unusual critical behavior of mesoscopic type-I superconductors


Reference:

Muller, A., Milosevic, M., Dale, S., Engbarth, M. and Bending, S. J., 2012. Magnetization measurements and Ginzburg-Landau simulations of micron-size β-tin samples: evidence for an unusual critical behavior of mesoscopic type-I superconductors. Physical Review Letters, 109 (19), 197003.

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    Official URL:

    http://dx.doi.org/10.1103/PhysRevLett.109.197003

    Abstract

    We describe investigations of the largely unexplored field of mesoscopic type-I superconductors. Micromagnetometry and 3D Ginzburg-Landau simulations of our single crystal β-tin samples in this regime reveal size- and temperature-dependent supercritical fields whose behavior is radically different from the bulk critical field HcB. We find that complete suppression of the intermediate state in medium-size samples can result in a surprising reduction of the critical field significantly below HcB. We also reveal an evolution of the superconducting-to-normal phase transition from the expected irreversible first order at low temperatures through the previously unobserved reversible first-order to a second-order transition close to Tc, where the critical field can be many times larger than HcB. Finally, we have identified striking correlations between the mesoscopic Hc3 for nucleation of surface superconductivity and the thermodynamic Hc near Tc. All these observations are entirely unexpected in the conventional type-I picture.

    Details

    Item Type Articles
    CreatorsMuller, A., Milosevic, M., Dale, S., Engbarth, M. and Bending, S. J.
    DOI10.1103/PhysRevLett.109.197003
    Uncontrolled Keywordsmesoscopic type i superconductors, ginzburg-landau theory, critical fields
    DepartmentsFaculty of Science > Physics
    Publisher StatementBending_PRL_2012_109_197003.pdf: Mueller, A. , Milosevic, M. , Dale, S. , Engbarth, M. , & Bending, S. (2012). Magnetization measurements and Ginzburg-Landau simulations of micron-size β-tin samples: Evidence for an unusual critical behavior of mesoscopic type-I superconductors. Physical Review Letters, 109(19), 197003. Copyright 2012 by the American Physical Society.
    RefereedYes
    StatusPublished
    ID Code32514

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