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

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.

preprint2009arXivOpen access
Shinya SatoHiraku OginoNaoto KawaguchiYukari KatsuraKohji KishioJun-ichi ShimoyamaHisashi KotegawaHideki Tou
cond-mat.supr-con
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Shinya SatoHiraku OginoNaoto KawaguchiYukari KatsuraKohji KishioJun-ichi ShimoyamaHisashi KotegawaHideki Tou

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