Expansion of vortex cores by strong electronic correlation in La2 − xSrxCuO4 at low magnetic induction

R. Kadono, W. Higemoto, A. Koda, M. I. Larkin, G. M. Luke, A. T. Savici, Y. J. Uemura, K. M. Kojima, T. Okamoto, T. Kakeshita, S. Uchida, T. Ito, K. Oka, M. Takigawa, M. Ichioka, K. Machida

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    20 Citations (Scopus)

    Abstract

    The vortex core radius ρv, defined as the peak position of the supercurrent around the vortex, has been determined by muon spin rotation measurements in the mixed state of La2 − xSrxCuO4 for x = 0.13, 0.15, and 0.19. At lower doping (x=0.13 and 0.15), ρv(T) increases with decreasing temperature T, which is opposite to the behavior predicted by the conventional theory. Moreover, ρv(T→0)is significantly larger than the Ginzburg-Landau coherence length determined by the upper critical field, and shows a clear tendency to decrease with increasing the doping x. These features can be qualitatively reproduced in a microscopic model involving antiferromagnetic electronic correlations.

    Original languageEnglish
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume69
    Issue number10
    DOIs
    Publication statusPublished - Mar 24 2004

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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