Magnetization Relaxation and Collective Vortex Pinning in the Fe-Based Superconductor SmFeAsO_0.9F_0.1

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By measuring the dynamic and traditional magnetization relaxations we investigate the vortex dynamics of the newly discovered superconductor SmFeAsO_0.9F_0.1 with Tc = 55K. It is found that the relaxation rate is rather large reflecting a small characteristic pinning energy. Moreover it shows a weak temperature dependence in wide temperature region, which resembles the behavior of the cuprate superconductors. Combining with the resistive data under different magnetic fields, a vortex phase diagram is obtained. Our results strongly suggest that the model of collective vortex pinning applies to this new superconductor very well.
5 pages, 5 figures

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/169439

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0806.0980
 http://arxiv.org/abs/0806.0980
 Phys. Rev. B 78, 092504 (2008)
 doi:10.1103/PhysRevB.78.092504

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arXiv