Pauli paramagnetic effects on vortices in superconducting TmNi2B2C

L. DeBeer-Schmitt, Morten Ring Eskildsen, M. Ichioka, K. Machida, N. Jenkins, C.D. Dewhurst, Asger Bech Abrahamsen, S.L. Bud'ko, P.C. Canfield

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    The magnetic field distribution around the vortices in TmNi2B2C in the paramagnetic phase was studied experimentally as well as theoretically. The vortex form factor, measured by small-angle neutron scattering, is found to be field independent up to 0.6H(c2) followed by a sharp decrease at higher fields. The data are fitted well by solutions to the Eilenberger equations when paramagnetic effects due to the exchange interaction with the localized 4f Tm moments are included. The induced paramagnetic moments around the vortex cores act to maintain the field contrast probed by the form factor.
    Original languageEnglish
    Article number167001
    JournalPhysical Review Letters
    Issue number16
    Number of pages4
    Publication statusPublished - 2007

    Bibliographical note

    Copyright 2007 American Physical Society


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