RIS ID

33432

Publication Details

Wang, X, Ghorbani, SR, Lee, S, Dou, SX, Lin, C, Johansen, T, Muller, K, Cheng, ZX, Peleckis, G, Shabazi, M, Qviller, A, Yurchenko, VV, Sun, G, & Sun, D (2010), Very strong intrinsic flux pinning and vortex avalanches in (Ba, K)Fe2As2 superconducting single crystals, Physical Review B (Condensed Matter and Materials Physics), 82(2), pp. 024525-1-024525-5.

Abstract

We report that the (Ba,K)Fe2As2 crystal with Tc=32 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.

Grant Number

ARC/DP0770205

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Link to publisher version (DOI)

http://dx.doi.org/10.1103/PhysRevB.82.024525