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Iron arsenides with three-dimensional FeAs layer networks: Can(n+1)/2(Fe1-xPtx)(2+3n)Ptn(n-1)/2As(n+1)(n+2)/2 (n = 2, 3).


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.

SUBMITTER: Katayama N 

PROVIDER: S-EPMC5171830 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Iron arsenides with three-dimensional FeAs layer networks: Ca<sub>n(n+1)/2</sub>(Fe<sub>1-x</sub>Pt<sub>x</sub>)<sub>(2+3n)</sub>Pt<sub>n(n-1)/2</sub>As<sub>(n+1)(n+2)/2</sub> (n = 2, 3).

Katayama Naoyuki N   Onari Seiichiro S   Matsubayashi Kazuyuki K   Uwatoko Yoshiya Y   Sawa Hiroshi H  

Scientific reports 20161220


We report the comprehensive studies between synchrotron X-ray diffraction, electrical resistivity and magnetic susceptibility experiments for the iron arsenides Ca<sub>n(n+1)/2</sub>(Fe<sub>1-x</sub>Pt<sub>x</sub>)<sub>(2+3n)</sub>Pt<sub>n(n-1)/2</sub>As<sub>(n+1)(n+2)/2</sub> for n = 2 and 3. Both structures crystallize in the monoclinic space group P2<sub>1</sub>/m (#11) with three-dimensional FeAs structures. The horizontal FeAs layers are bridged by inclined FeAs planes through edge-sharing  ...[more]

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