Precursor diamagnetism above the superconducting transition in YNi_mathsf{2}B_mathsf{2}C |
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Authors: | A. Lascialfari T. Mishonov A. Rigamonti I. Zucca G. Behr W. Loser S. L. Drechsler |
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Affiliation: | (1) Department of Physics A. Volta and Unita INFM, University of Pavia, Via Bassi 6, 27100 Pavia, Italy;(2) Laboratorium voor Vaste-Stoffisyca en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium;(3) Department of Theoretical Physics, Faculty of Physics, Sofia University St. Kliment Ohridski, 5 J. Bourchierb Blvd., 1164 Sofia, Bulgaria;(4) Institut fur Festkorper and Werkstofforschung Dresden, Postfach 270116, 01171, Germany |
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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 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.Received: 23 April 2003, Published online: 15 October 2003PACS: 74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) - 74.20.De Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) - 74.25.Ha Magnetic properties |
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