Vortex dynamics and pinning properties analysis of MgB2 bulk samples by ac susceptibility measurements

C. Senatore*, M. Polichetti, D. Zola, T. Di Matteo, G. Giunchi, S. Pace

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Flux line dynamics have been investigated on MgB2 bulk superconductors obtained by reactive liquid infiltration by measuring the ac magnetic susceptibility. The fundamental and third harmonics have been studied as a function of temperature, dc magnetic field, ac field amplitude and frequency. In order to determine the dynamical regimes governing the vortex motion, the experimental results have been compared with susceptibility curves obtained by numerical calculations of the non-linear diffusion equation for the magnetic field. The frequency behaviour of the third harmonic response, that cannot be explained by frequency dependent critical state models, has been related to the current dependence of the flux creep activation energy U(J) in the diffusion coefficient. In this way we have shown that the measured curves are correctly interpreted within the framework of a vortex glass description.

Original languageEnglish
Pages (from-to)183-187
Number of pages5
JournalSuperconductor Science and Technology
Volume16
Issue number2
DOIs
Publication statusPublished - Feb 2003
Externally publishedYes

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