New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)

Hiraku Ogino; Yukari Katsura; Shigeru Horii; Kohji Kishio; Jun-ichi Shimoyama

doi:10.1088/0953-2048/22/8/085001

New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)

Superconductivity 2009-06-24 v3

Authors: Hiraku Ogino , Yukari Katsura , Shigeru Horii , Kohji Kishio , Jun-ichi Shimoyama

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Abstract

We have discovered new layered oxyarsenides (Fe2As2)(Sr4M2O6) (M = Sc, Cr: M-22426). These materials are isostructural with (Fe2P2)(Sr4Sc2O6), which was found in our previous study. The new compounds are tetragonal with a space group of P4/nmm and consist of the anti-fluorite type FeAs layer and perovskite-type blocking layer. The lattice constants are a = 4.050 A, c = 15.809 A for M = Sc and a = 3.918 A, c = 15.683 A for M = Cr. These compounds have long interlayer Fe-Fe distances corresponding to the c-axis length, the 15.8 A in Sc-22426 is the longest in the iron-based oxypnictide systems. Chemical flexibility of the perovskite block in this system was probed by chromium containing (Fe2As2)(Sr4Cr2O6). Different trends were found in bond angle and bond length of the new oxypnictides compared to the reported systems, such as REFePnO. Absence of superconductivity in these compounds is considered to be due to insufficient carrier concentration as in the case of undoped REFeAsO.

Keywords

electronic structure of materials

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@article{arxiv.0903.5124,
  title  = {New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)},
  author = {Hiraku Ogino and Yukari Katsura and Shigeru Horii and Kohji Kishio and Jun-ichi Shimoyama},
  journal= {arXiv preprint arXiv:0903.5124},
  year   = {2009}
}

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7 pages, 5 figures, 1 table

New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)

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