Vortex pinning in bulk-processed Y–Ba–Cu–O with ZrO2 nano-particles: Optimum pinning center size
| Autor: | A. Ouerghi, Nahed Moutalbi, Jacques G. Noudem, Ali M’chirgui, E. Djurado |
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| Rok vydání: | 2011 |
| Předmět: |
Superconductivity
Materials science Flux pinning Nanocomposite Condensed matter physics Energy Engineering and Power Technology Nanoparticle Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Vortex Condensed Matter::Superconductivity Particle size Electrical and Electronic Engineering Pinning force |
| Zdroj: | Physica C: Superconductivity. 471:97-103 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2010.12.012 |
| Popis: | Crystalline defects on the nano-scale were successfully introduced into YBCO high-temperature superconductors (HTS) by ZrO 2 nanometer particles addition in order to strongly pin the quantized vortices. Three batches of ZrO 2 nano-particles with different particle size distributions were used. The corresponding mean nano-particle diameters are respectively, 287, 536 and 764 nm. Serving as artificial pinning centers (APC), non-superconducting nano-particles cause a remarkable enhancement of critical current density ( J c ) at T = 77 K. This improvement has been shown to depend on the size of APC. The pinning strength of nano-particles inclusions has been found to be greater with wide size dispersed nano-particles. Our results indicate that pinning properties and vortex dynamics depend on the size of APCs. The introduction of APCs with controlled size is indispensable to achieve a high J c . |
| Databáze: | OpenAIRE |
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