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Precursor diamagnetism above the superconducting transition in YNi\(_\mathsf{2}\)B\(_\mathsf{2}\)C

  • A. LascialfariEmail author
  • T. Mishonov
  • A. Rigamonti
  • I. Zucca
  • G. Behr
  • W. Loser
  • S. L. Drechsler
OriginalPaper

Abstract.

High-resolution SQUID magnetization measurements in a single crystal of YNi2B2C around the superconducting transition are reported. The diamagnetic magnetization -M fl at constant field H as a function of temperature and isothermal magnetization curves -M fl vs. H are used to derive insights on precursor phenomena approaching the bulk transition temperature \(T_c(H = 0) = 15.25\pm0.02\) K. The precursor diamagnetism is found strongly enhanced with respect to the conventional Ginzburg-Landau value for Gaussian fluctuations and the curves -M fl vs. H exhibit an upturn with the field and hysteretic effects up to T * = 15.4 K. These results are interpreted in terms of a non-zero order parameter in superconducting droplets above the bulk T c . These droplets are likely to be related to inhomogeneities resulting from small amount of boron to carbon substitutions.

Keywords

Boron Transition Temperature Magnetization Measurement Magnetization Curve Constant Field 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • A. Lascialfari
    • 1
    Email author
  • T. Mishonov
    • 2
    • 3
  • A. Rigamonti
    • 1
  • I. Zucca
    • 1
  • G. Behr
    • 4
  • W. Loser
    • 4
  • S. L. Drechsler
    • 4
  1. 1.Department of Physics “A. Volta” and Unita’ INFM University of PaviaPaviaItaly
  2. 2.Laboratorium voor Vaste-Stoffisyca en MagnetismeKatholieke Universiteit LeuvenLeuvenBelgium
  3. 3.Department of Theoretical Physics, Faculty of PhysicsSofia University St. Kliment OhridskiSofiaBulgaria
  4. 4.Institut fur Festkorper and Werkstofforschung DresdenGermany

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