Abstract
We report the comprehensive studies between synchrotron X-ray diffraction, electrical resistivity and magnetic susceptibility experiments for the iron arsenides Can(n+1)/2(Fe1−xPtx)(2+3n)Ptn(n−1)/2As(n+1)(n+2)/2 for n = 2 and 3. Both structures crystallize in the monoclinic space group P21/m (#11) with three-dimensional FeAs structures. The horizontal FeAs layers are bridged by inclined FeAs planes through edge-sharing FeAs5 square pyramids, resulting in triangular tunneling structures rather than the simple layered structures found in conventional iron arsenides. n = 3 system shows a sign of superconductivity with a small volume fraction. Our first-principles calculations of these systems clearly indicate that the Fermi surfaces originate from strong Fe-3d characters and the three-dimensional nature of the electric structures for both systems, thus offering the playgrounds to study the effects of dimensionality on high Tc superconductivity.
Highlights
We report the comprehensive studies between synchrotron X-ray diffraction, electrical resistivity and magnetic susceptibility experiments for the iron arsenides Can(n+1)/2(Fe1−xPtx)(2+3n)Ptn(n−1)/2As(n+1)(n+2)/2 for n = 2 and 3
We report the relationship between crystal structures and physical properties for the iron arsenides with three-dimensional FeAs networks, Can(n+1)/2(Fe1−xPtx)(2+3n)Ptn(n−1)/2As(n+1)(n+2)/2 with n = 2 and 3, where the horizontal FeAs layers are bridged by inclined FeAs planes through edge-sharing FeAs5 square pyramids
Based on the structural parameters collected using synchrotron X-ray diffraction experiments, we clarify the three-dimensional nature in electric structures for these systems by first-principles calculations using the WIEN2k package
Summary
Based on the structural parameters collected using synchrotron X-ray diffraction experiments, we clarify the three-dimensional nature in electric structures for these systems by first-principles calculations using the WIEN2k package. By using the single crystal synchrotron X-ray diffraction data collected at SPring-8, we clarified that the platinum substitutions occur at all iron sites composing the FeAs layers and bridges.
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