Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-18
Supercond. Sci. Technol. 24 (2011) 085020
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures, 1 table
Scientific paper
10.1016/j.physc.2012.02.039
We have discovered a new layered iron arsenide oxide (Fe2As2)(Ca5(Mg,Ti)4Oy). Crystal structure of this compound is identical to (Fe2As2)(Ca5(Sc,Ti)4Oy), which was found in our previous study, having a tetragonal cell with a space group of I4/mmm and consists of anti-fluorite type FeAs layers and oxide layers having quadruple perovskite cells. The lattice constants of this compound are a = 3.864(2) A and c = 41.05(2) A. This compound exhibited bulk superconductivity with Tc onset ~39 K in magnetization measurement and ~43 K in resistivity measurement.
Kawaguchi Naoto
Kishio Kohji
Ogino Hiraku
Shimizu Yasuaki
Shimoyama Jun-ichi
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