Third harmonic ac susceptibility measurements in MgB2 bulk: frequency behavior of IL and 3D glass pinning analysis
✍ Scribed by D. Di Gioacchino; P. Tripodi; U. Gambardella; V. Sandu; S. Popa; L. Miu; D. Vinko
- Book ID
- 103890253
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 396 KB
- Volume
- 408-410
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
The third harmonics of the ac susceptibility v 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 v 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 v 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.