Direct observation of local potassium variation and its correlation to electronic inhomogeneity in (Ba(1-x)K(x))Fe2As2 pnictide.
نویسندگان
چکیده
Local fluctuations in the distribution of dopant atoms are thought to cause the nanoscale electronic disorder or phase separation in pnictide superconductors. Atom probe tomography has enabled the first direct observations of dopant species clustering in a K-doped 122-phase pnictide. First-principles calculations suggest the coexistence of static magnetism and superconductivity on a lattice parameter length scale over a wide range of dopant concentrations. Our results provide evidence for a mixed scenario of phase coexistence and phase separation, depending on local dopant atom distributions.
منابع مشابه
Local structural studies of Ba(1-x)K(x)Fe2As2 using atomic pair distribution function analysis.
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متن کاملبررسی آلایش پتاسیم در نمونه ابررسانا ( YBa2-xK>xCu3 O6+y) توسط آنالیز الگوهای پراش اشعه x
We have used GSAS package for Reitveld analysis of XRD data from H-Tc superconductor powder YBa2-xKxCu3O7-y (0<1) samples. The procedure of Potassium doping, x, results in some residual impurities in the sample and so few extra peaks in the XRD patterns would appeared. On the other hand, substituting K by Ba causes, to some extent, oxygen depletion and also the lowering of the Ba (K) plane po...
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عنوان ژورنال:
- Physical review letters
دوره 106 24 شماره
صفحات -
تاریخ انتشار 2011