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| Author | Luzuriaga, J.; Badía-Majós, A.; Nieva, G.; Giordano, J.L.; Lopez, C.; Serquis, A.; Serrano, G. | ||||
| Title | Magnetic relaxation induced by transverse flux shaking in MgB2 superconductors | Type | Journal Article | ||
| Year | 2009 | Publication | Superconductor Science and Technology | Abbreviated Journal | Supercond. Sci. Technol. |
| Volume | 22 | Issue | Pages | 15021 | |
| Keywords | MgB2 | ||||
| Abstract | We report on measurements and numerical simulations of the behavior of MgB2 superconductors when magnetic field components are applied along mutually perpendicular directions. By closely matching the geometry in simulations and measurements, full quantitative agreement is found. The critical state theory and a single phenomenological law, i.e. the field dependence of the critical current density Jc(B), are sufficient for a full quantitative description of the measurements. These were performed in thick strips of carbon nanotube doped MgB2 samples. Magnetization was measured in two orthogonal directions using a SQUID magnetometer. Magnetic relaxation effects induced by the application of an oscillatory perpendicular field were observed and simulated numerically. The measurements confirm the numerical predictions, that two relaxation regimes appear, depending on the amplitude of the applied magnetic field. The overall agreement constitutes a convincing validation of the critical state model and the numerical procedures used. | ||||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 421 | ||
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| Author | Giordano, J.L.; Luzuriaga, J.; Badía-Majós, A.; Nieva, G.; Ruiz-Tagle, I. A. | ||||
| Title | Magnetization collapse in polycrystalline YBCO under transport current cycles | Type | Journal Article | ||
| Year | 2006 | Publication | Superconducting Science and Technology | Abbreviated Journal | Supercond. Sci. Technol. |
| Volume | 19 | Issue | 4 | Pages | 385-391 |
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| Abstract | We report measurements of the hysteretic magnetization of YBCO under superimposed transport current cycles, together with numerical simulations of magnetization and current density profiles in the corresponding parallel configuration. Field cooled (FC) and zero-field-cooled (ZFC) experiments were carried out on polycrystalline YBa2Cu3O7?x cylinders, with both the applied magnetic field and transport current in the axial direction, and the current cycled several times, around and above the dissipative threshold. As in previously reported multicomponent field configuration experiments, the magnetization is seen to collapse to a more stable state both in FC and ZFC, because of the interplay between the shielding and transport currents. The results of our numerical simulations are in good qualitative agreement with the measurements, and the competition between shielding and transport due to vortex-pinning interactions and equilibrium magnetization effects are shown to play an important role in the range of our experiments. | ||||
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| ISSN | 0953-2048 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 467 | ||
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| Author | Luzuriaga, J.; Badía-Majós, A.; Nieva, G.; Giordano, J.L.; Lopez, C.; Serquis, A.; Serrano, G. | ||||
| Title | Experimental and numerical study of transverse flux shaking in MgB2 superconductors | Type | Conference Article | ||
| Year | 2009 | Publication | Journal of Physics: Conference Series | Abbreviated Journal | J. Phys.: Conf. Ser. |
| Volume | 167 | Issue | Pages | 012009 | |
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| Abstract | Magnetization measurements in the mixed state of thick strips of carbon nanotube doped MgB 2 in crossed fields configurations are reported, together with numerical simulations performed with a geometry equivalent to the sample shape. The samples were subjected to magnetic field components along mutually perpendicular directions, an oscillatory field in one direction and a remanent magnetization in the perpendicular direction. The magnetic response along the oscillatory field and the magnetic relaxation perpendicular to it are observed and simulated using the critical state theory. A remarkable quantitative agreement between the experiment and the theory was obtained. |
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| Area | Expedition | Conference | XIX Latin American Symposium on Solid State Physics (SLAFES XIX) | ||
| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 737 | ||
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| Author | Ale Crivillero, M.V.; Amigó, M.L.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Nieva, G. | ||||
| Title | In Plane Vortex Dynamic Anisotropy in the Iron Deficient Fe_{1-y}Se Superconductor | Type | Journal Article | ||
| Year | 2015 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low Temp. Phys. |
| Volume | 179 | Issue | 1-2 | Pages | 9-14 |
| Keywords | Iron-based superconductors; Electrical transport; Critical currents | ||||
| Abstract | We present electrical transport measurements in the superconducting dissipative state of crystalline iron deficient Fe 1−y Se samples. These iron deficient samples were synthesized using NaCl/KCl flux and are characterized by the presence of correlated defects. The dissipation in electrical transport experiments, when the driving current is perpendicular or parallel to the crystal planes, depends strongly on the direction of the applied magnetic field , ( H=12 T), within the sample plane. There is a dissipation modulation each 60∘ due to the presence of the correlated defects. We correlate these angular dependent features with the variation of the critical currents ( Jc ) changing the direction of H confined in the crystals planes. Jc was measured from magnetization loops at fixed temperatures and angles of H always within the basal planes. | ||||
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| Publisher | Springer US | Place of Publication | Editor | ||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 708 | ||
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| Author | Amigó, M.L.; Crivillero, V.A.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Nieva, G. | ||||
| Title | Vortex pinning by intrinsic correlated defects in Fe<inf>1-y</inf>Se | Type | Journal Article | ||
| Year | 2014 | Publication | Journal of Physics: Conference Series | Abbreviated Journal | J. Phys.: Conf. Ser. |
| Volume | 507 | Issue | Part 1 | Pages | |
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| Notes | Cited By :1; Export Date: 14 March 2018 | Approved | no | ||
| Call Number | BT @ jguimpel @ | Serial | 790 | ||
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