Carbon nanotubes effects on the relaxation properties and critical current densities of MgB 2 superconductor
Addition of nonsuperconducting phases, such as carbon nanotubes, can modify the superconducting properties of MgB 2 samples, improving the critical current density and upper critical field. A full understanding of the flux creep mechanism involved is crucial to the development of superconducting mag...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | Argentina |
| Institución: | Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales |
| Repositorio: | Biblioteca Digital (UBA-FCEN) |
| Idioma: | inglés |
| OAI Identifier: | paperaa:paper_00218979_v114_n2_p_Pasquini |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00218979_v114_n2_p_Pasquini |
| Access Level: | acceso abierto |
| Palabra clave: | Correlation lengths Flux creep mechanism Low temperatures Persistent mode Relaxation property Single vortices Superconducting properties Upper critical fields Creep Superconducting magnets Superconducting wire Superconductivity Carbon nanotubes |
| Sumario: | Addition of nonsuperconducting phases, such as carbon nanotubes, can modify the superconducting properties of MgB 2 samples, improving the critical current density and upper critical field. A full understanding of the flux creep mechanism involved is crucial to the development of superconducting magnets in persistent mode, one of the main thrusts for the development of MgB 2 wires. In this paper we present a creep study in bulk MgB 2 samples, pure and with different amounts of carbon nanotubes additions. We conclude that the most consistent picture at low temperatures is a single vortex pinning regime, where the correlation length is limited by the grain size. We introduce a novel analysis that allows us to identify the region where the Anderson-Kim model is valid. © 2013 AIP Publishing LLC. |
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