Analysis of magnetization relaxation in MgB2 bulk samples obtained by electric-field assisted sintering
The relaxation of the irreversible magnetization of MgB2 bulk samples obtained by electric-field assisted sintering was investigated using the SQUID magnetometry for a magnetic field H up to 50 kOe applied in zero-field-cooling conditions. We observed a crossover plastic creep at high temperatures T...
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| Veröffentlicht in: | Physica. C, Superconductivity Superconductivity, 2008-11, Vol.468 (22), p.2279-2282 |
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| container_end_page | 2282 |
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| container_issue | 22 |
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| container_title | Physica. C, Superconductivity |
| container_volume | 468 |
| creator | MIU, L IVAN, I ALDICA, G BADICA, P GROZA, J. R MIU, D JAKOB, G ADRIAN, H |
| description | The relaxation of the irreversible magnetization of MgB2 bulk samples obtained by electric-field assisted sintering was investigated using the SQUID magnetometry for a magnetic field H up to 50 kOe applied in zero-field-cooling conditions. We observed a crossover plastic creep at high temperatures T-elastic creep at low T, described by H {proportional to} T-2 in the low T range, which appears to be caused by the macroscopic currents induced in the sample during magnetization measurements. By decreasing T below this line the determined creep exponent rapidly overcomes the widely accepted theoretical values for elastic (collective) pinning. This behaviour can easily be explained through the occurrence of micro flux jumps, leading to a finite magnetization relaxation rate in the low-T limit. |
| doi_str_mv | 10.1016/j.physc.2008.08.001 |
| format | Article |
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| ispartof | Physica. C, Superconductivity, 2008-11, Vol.468 (22), p.2279-2282 |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Physics Properties of type I and type II superconductors Superconductivity Vortex lattices ,flux pinning, flux creep |
| title | Analysis of magnetization relaxation in MgB2 bulk samples obtained by electric-field assisted sintering |
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