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

被引：73

作者：

Ogino, Hiraku ^{[1
,2
]}

Katsura, Yukari ^{[3
]}

Horii, Shigeru ^{[2
,4
]}

Kishio, Kohji ^{[1
,2
]}

Shimoyama, Jun-ichi ^{[1
,2
]}

机构：

[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[2] JST TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[3] RIKEN, Magnet Mat Lab, Wako, Saitama 3510106, Japan

[4] Kochi Univ Technol, Dept Environm Syst Engn, Kami, Kochi 7828502, Japan

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2009年 / 22卷 / 08期

关键词：

ZRCUSIAS TYPE-STRUCTURE; CRYSTAL-STRUCTURE; LAYERED OXYSULFIDES; SUPERCONDUCTIVITY; SERIES; SR; BA; CO;

D O I：

10.1088/0953-2048/22/8/085001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have discovered new arsenide oxides (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 a perovskite-type blocking layer. These compounds have long interlayer Fe-Fe distances corresponding to the c-axis length; the 15.8 angstrom in Sc-22426 is the longest in the iron-based pnictide oxide 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 pnictide oxides compared to the reported systems, such as REFePnO. The absence of superconductivity in these compounds is considered to be due to insufficient carrier concentration as in the case of undoped REFeAsO.

引用

页数：5

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