Affordable Access

deepdyve-link
Publisher Website

Superconductivity Above 40 K Observed in a New Iron Arsenide Oxide (Fe2As2)(Ca4(Mg,Ti)3Oy)

Authors
  • Ogino, Hiraku
  • Shimizu, Yasuaki
  • Ushiyama, Koichi
  • Kawaguchi, Naoto
  • Kishio, Kohji
  • Shimoyama, Jun-ichi
Type
Published Article
Publication Date
Jun 14, 2010
Submission Date
Jun 11, 2010
Identifiers
DOI: 10.1143/APEX.3.063103
Source
arXiv
License
Yellow
External links

Abstract

A new layered iron arsenide oxide (Fe2As2)(Ca4(Mg,Ti)3Oy) was discovered. Its crystal structure is tetragonal with a space group of I4/mmm consisted of the anti-fluorite type FeAs layer and blocking layer of triple perovskite cells and is identical with (Fe2As2)(Sr4(Sc,Ti)3O8) discovered in our previous study. The lattice constants of (Fe2As2)(Ca4(Mg,Ti)3Oy) are a = 3.877 A and c = 33.37 A. This compound exhibited bulk superconductivity up to 43 K in susceptibility measurement without intentional carrier doping. A resistivity drop was observed at ~47 K and zero resistance was achieved at 42 K. These values correspond to the second highest Tc among the layered iron-based superconductors after REFeAsO system.

Report this publication

Statistics

Seen <100 times