Physics – Condensed Matter – Superconductivity
Scientific paper
2001-09-21
Physics
Condensed Matter
Superconductivity
Tex file, 4 pages, 3 ps figures, submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevB.65.180501
The fluctuating diamagnetic magnetization Mfl at constant field H as a function of temperature and the isothermal magnetization Mfl vs H are measured in MgB2, above the superconducting transition temperature. The expressions for Mfl in randomly oriented powders are derived in the Gaussian approximation of local Ginzburg-Landau theory and used for the analysis of the data. The scaled magnetization Mfl/H^{1/2}*T is found to be field dependent. In the limit of evanescent field the behaviour for Gaussian fluctuations is obeyed while for H>~ 100 Oe the field tends to suppress the fluctuating pairs, with a field dependence of Mfl close to the one expected when short wavelength fluctuations and non-local electrodynamic effects are taken into account. Our data, besides providing the isothermal magnetization curves for T>Tc(0) in a BCS-type superconductor such as MgB2, evidence an enhancement of the fluctuating diamagnetism which is related to the occurrence in this new superconductor of an anisotropic spectrum of the superconducting fluctuations.
Lascialfari Alessandro
Mishonov Todor
Rigamonti A.
Tedesco P.
Varlamov Andrei A.
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