### 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 |
---|---|

Article number | 39280 |

Journal | Scientific Reports |

Volume | 6 |

DOIs | |

Publication status | Published - Dec 20 2016 |

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### ASJC Scopus subject areas

- General

### Cite this

_{n(n+1)/2}(Fe

_{1-x}Pt

_{x})

_{(2+3n)}Pt

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

_{(n+1)(n+2)/2}(n = 2, 3).

*Scientific Reports*,

*6*, [39280]. https://doi.org/10.1038/srep39280

**Iron arsenides with three-dimensional FeAs layer networks : Ca _{n(n+1)/2} (Fe _{1-x} Pt _{x}) _{(2+3n)} Pt _{n(n-1)/2} As _{(n+1)(n+2)/2} (n = 2, 3).** / Katayama, Naoyuki; Onari, Seiichiro; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya; Sawa, Hiroshi.

Research output: Contribution to journal › Article

_{n(n+1)/2}(Fe

_{1-x}Pt

_{x})

_{(2+3n)}Pt

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

_{(n+1)(n+2)/2}(n = 2, 3)',

*Scientific Reports*, vol. 6, 39280. https://doi.org/10.1038/srep39280

_{n(n+1)/2}(Fe

_{1-x}Pt

_{x})

_{(2+3n)}Pt

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

_{(n+1)(n+2)/2}(n = 2, 3). Scientific Reports. 2016 Dec 20;6. 39280. https://doi.org/10.1038/srep39280

}

TY - JOUR

T1 - Iron arsenides with three-dimensional FeAs layer networks

T2 - Ca n(n+1)/2 (Fe 1-x Pt x) (2+3n) Pt n(n-1)/2 As (n+1)(n+2)/2 (n = 2, 3)

AU - Katayama, Naoyuki

AU - Onari, Seiichiro

AU - Matsubayashi, Kazuyuki

AU - Uwatoko, Yoshiya

AU - Sawa, Hiroshi

PY - 2016/12/20

Y1 - 2016/12/20

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85006728982&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006728982&partnerID=8YFLogxK

U2 - 10.1038/srep39280

DO - 10.1038/srep39280

M3 - Article

AN - SCOPUS:85006728982

VL - 6

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 39280

ER -