Title :
Glass-collective pinning and flux creep dynamics regimes in MgB2 bulk
Author :
Gioacchino, Daniele Di ; Tripodi, Paolo ; Vinko, Jenny Darja
Author_Institution :
Nat. Inst. of Nucl. Phys.-Nat. Lab. of Frascati, Italy
fDate :
6/1/2005 12:00:00 AM
Abstract :
Superconducting dynamic response in zero field cooling (ZFC) of MgB2 bulk has been analyzed using high harmonic ac susceptibility measurements (χn). The driving external ac magnetic field is in the frequency range [107Hzdc<5T] and the temperature has been varied in the range [15Kdc investigate different current levels. This way, different pinning regimes as single vortex, small bundle, large bundle are studied. Using this approach some parts of the MgB2 three-dimensional phase diagram H-T-J can be described.
Keywords :
flux flow; flux pinning; magnesium compounds; magnetic susceptibility; phase diagrams; type II superconductors; MgB2; MgB2 bulk; MgB2 three-dimensional phase diagram; external ac magnetic field; external dc magnetic field; flux creep dynamics regimes; glass-collective pinning; high harmonic ac susceptibility measurements; magnesium-boron compound; single vortex; superconducting dynamic response; zero field cooling; Character generation; Coils; Creep; Frequency; Harmonic analysis; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic susceptibility; Temperature; Flux pinning regimes; high harmonic magnetic ac susceptibility measurements; magnesium-boron compound;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.848861
