Iron Isotope Effect and Local Lattice Dynamics in the (Ba, K)Fe2As2 Superconductor Studied by Temperature-Dependent EXAFS
作者： Wangsheng Chu , Jie Cheng , Shengqi Chu , Tiandou Hu , Augusto Marcelli
DOI: 10.1038/SREP01750
关键词: Isotope 、 Extended X-ray absorption fine structure 、 Chemical physics 、 Phonon 、 Kinetic isotope effect 、 Lattice (order) 、 Lattice dynamics 、 Superconductivity 、 Materials science 、 Electrical resistivity and conductivity
摘要: Currently available investigations of the isotope effect in Fe-based superconductors are all based on macroscopic resistivity and susceptibility measurements results highly controversial. Here we present an investigation Fe (Ba, K)Fe2As2 superconductor by temperature-dependent EXAFS framework Einstein model. This method separates static structural contribution local lattice contribution. Results point out substitution has a negligible inter-atomic distances. On contrary, both vibrations Fe-As Fe-Fe bonds show strong iron dependence, which is marker “intrinsic” effect. bulk to dynamics suggests phonons play important role three-dimensional electron-phonon interaction should be considered understand superconducting mechanism iron-based superconductors.
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