Abstract
The third harmonics of the ac susceptibility χ 3 of MgB 2 bulk samples have been measured in the frequency range 61–1070 Hz as a function of the temperature for different applied dc magnetic fields. The irreversibility line ( T irr versus H dc) deduced from the temperature onsets of χ 3 for each field shows a frequency dependence: The onset temperature increases as the frequency increases. This frequency dependence has been analyzed using the 3D vortex-glass model. Moreover the real versus imaginary components of the χ 3 for each dc magnetic field have been interpreted with a 3D glass creep using a numerical analysis based on a non-linear diffusion equation of the magnetic field.
Published Version
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