Harmonic susceptibilities and pinning properties of MgB2 bulk superconductors

Carmine Senatore*, Massimiliano Polichetti, Danilo Zola, Tiziana Di Matteo, Giovanni Giunchi, Sandro Pace

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


The fundamental and third harmonics of the ac magnetic susceptibility have been studied on MgB2 bulk superconductors, obtained by reactive liquid infiltration. In particular, measurements performed as a function of temperature, dc magnetic field, ac field amplitude and frequency have been compared with susceptibility curves obtained by means of numerical simulations of the non-linear diffusion equation for the magnetic field. The experimental frequency dependence of the χ1″(T) and |χ3|(T) peak amplitude cannot be explained by frequency dependent critical state models. On the contrary, we have shown that the measured curves are correctly derived using a diffusion coefficient dominated by a creep process within the framework of the vortex glass approach.

Original languageEnglish
Pages (from-to)161-162
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Publication statusPublished - May 2003
Externally publishedYes
Eventproceedings of the 23rd international conference on low temper - Hiroshima, Japan
Duration: 20 Aug 200227 Aug 2002


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