Superconductivity in New Iron Pnictide Oxide (Fe2As2)(Sr4(Mg,Ti)2O6)

Shinya Sato; Hiraku Ogino; Naoto Kawaguchi; Yukari Katsura; Kohji Kishio; Jun-ichi Shimoyama; Hisashi Kotegawa; Hideki Tou

doi:10.1088/0953-2048/23/4/045001

Superconductivity in New Iron Pnictide Oxide (Fe2As2)(Sr4(Mg,Ti)2O6)

Superconductivity 2010-03-26 v1

Authors: Shinya Sato , Hiraku Ogino , Naoto Kawaguchi , Yukari Katsura , Kohji Kishio , Jun-ichi Shimoyama , Hisashi Kotegawa , Hideki Tou

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Abstract

We have discovered a new iron pnictide oxide superconductor (Fe2As2)(Sr4(Mg,Ti)2O6). This material is isostructual with (Fe2As2)(Sr4M2O6) (M = Sc, Cr, V), which were found in previous studies. The structure of this compound is tetragonal with a space group of P4/nmm and consists of the anti-fluorite type FeAs layer and perovskite-type block layer. The lattice constants are a = 3.935 A and c = 15.952 A for (Fe2As2)(Sr4MgTiO6). Bulk superconductivity with Tc(onset) of ~26 K was observed for a partially Co substituted sample. Moreover, Co-free and Ti-rich samples exhibited higher Tc(onset)'s above 35 K, which were further enhanced by applying high pressures up to ~43 K.

Keywords

iron pnictide superconductor oxide superconductor feas layer perovskite block layer high pressure critical temperature

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@article{arxiv.0912.1840,
  title  = {Superconductivity in New Iron Pnictide Oxide (Fe2As2)(Sr4(Mg,Ti)2O6)},
  author = {Shinya Sato and Hiraku Ogino and Naoto Kawaguchi and Yukari Katsura and Kohji Kishio and Jun-ichi Shimoyama and Hisashi Kotegawa and Hideki Tou},
  journal= {arXiv preprint arXiv:0912.1840},
  year   = {2010}
}

Comments

Resubmission of arXiv:0909.2945 with new data

Superconductivity in New Iron Pnictide Oxide (Fe2As2)(Sr4(Mg,Ti)2O6)

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