Very strong intrinsic flux pinning and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals

By Xiao-lin Wang, S. Ghorbani, Sung-Ik Lee, Shixue Dou, C. Lin, T. Johansen, K. Müller, Zhenxiang Cheng, G. Peleckis, M. Shabazi and 4 more. 2010

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We report that the (Ba,K)Fe2As2 crystal with Tc =3 2 K shows a pinning potential, U0, as high as 104 K, with U0 showing very little field dependence. The (Ba,K)Fe2As2 single crystals become isotropic at low temperatures and high magnetic fields, resulting in a very rigid vortex lattice, even in fields very close to Hc2. The isotropic rigid vortices observed in the two-dimensional (2D) (Ba,K)Fe2As2 distinguish this compound from 2D high-Tc cuprate superconductors with 2D vortices. The vortex avalanches were also observed at low temperatures in the (Ba,K)Fe2As2 crystal. It is proposed that it is the K substitution that induces both almost isotropic superconductivity and the very strong intrinsic pinning in the (Ba,K)Fe2As2 crystal.

Subfields: Accounting, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/529674cc875bd761d83625b4d6a1d0db238b594b