Magnetic Impurities in the Pnictide Superconductor Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$

Details Magnetic Impurities in the Pnictide Superconductor Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ Magnetic Impurities in the Pnictide Superconductor Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$

2009-03-04

arxiv.org/abs/0903.0674v1

Physics

Condensed Matter

Superconductivity

14 pages, 6 figures (submitted to New Journal of Physics)

Scientific paper

NMR measurements have been performed on single crystals of Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ (x = 0, 0.45) and CaFe$_2$As$_2$ grown from Sn flux. The Ba-based pnictide crystals contain significant amounts of Sn in their structure, $\sim 1$%, giving rise to magnetic impurity effects evident in the NMR spectrum and in the magnetization. Our experiments show that the large impurity magnetization is broadly distributed on a microscopic scale, generating substantial magnetic field gradients. There is a concomitant 20% reduction in the transition temperature which is most likely due to magnetic electron scattering. We suggest that the relative robustness of superconductivity ($x=0.45$) in the presence of severe magnetic inhomogeneity might be accounted for by strong spatial correlations between impurities on the coherence length scale.

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