## Abstract

We report the comprehensive studies between synchrotron X-ray diffraction, electrical resistivity and magnetic susceptibility experiments for the iron arsenides Ca _{n(n+1)/2} (Fe _{1-x} Pt _{x}) _{(2+3n)} Pt _{n(n-1)/2} As _{(n+1)(n+2)/2} for n = 2 and 3. Both structures crystallize in the monoclinic space group P2 1/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 T c superconductivity.

Original language | English |
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Article number | 39280 |

Journal | Scientific reports |

Volume | 6 |

DOIs | |

Publication status | Published - Dec 20 2016 |

## ASJC Scopus subject areas

- General

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_{x})

_{(2+3n)}Pt

_{n(n-1)/2}As

_{(n+1)(n+2)/2}(n = 2, 3)'. Together they form a unique fingerprint.