Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in(Ba1−xKx)Fe2As2Pnictide

W. K. Yeoh, B. Gault, X. Y. Cui, C. Zhu, M. P. Moody, L. Li, R. K. Zheng, W. X Li, X. L. Wang, S. X. Dou, G. L. Sun, C. T. Lin (+1 others)
2011 Physical Review Letters  
Local fluctuations in the distribution of dopant atoms are a suspected cause of nanoscale electronic disorder or phase separation observed within the pnictide superconductors. Atom probe tomography results present the first direct observations of dopant nano-clustering in a K-doped 122-phase pnictides. First-principles calculations suggest the coexistence of static magnetism and superconductivity on a lattice parameter length scale over a large range of doping concentrations. Collectively, our
more » ... Collectively, our results provide evidence for a mixed scenario of phase coexistence and phase separation originating from variation of dopant atom experiments distroibutions.
doi:10.1103/physrevlett.106.247002 pmid:21770591 fatcat:wwmg4ae6oze5vhgubfe5s5dn5e