New Iron Arsenide Oxides (Fe2As2)(Sr4(Sc,Ti)3O8), (Fe2As2)(Ba4Sc3O7.5), and (Fe2As2)(Ba3Sc2O5)
Naoto Kawaguchi, Hiraku Ogino, Yasuaki Shimizu, Kohji Kishio, Jun-ichi, Shimoyama
TL;DR
This paper reports the synthesis and structural analysis of new layered iron arsenide oxides with unique stacking of Fe2As2 and perovskite-type oxide layers, highlighting their structural features and magnetic properties.
Contribution
The study introduces three novel layered iron arsenide oxides with detailed structural characterization and magnetic property measurements, expanding the family of iron-based superconductors.
Findings
Structures are tetragonal with I4/mmm space group.
(Fe2As2)(Ba4Sc3O7.5) has an interlayer distance of ~18.7 Å.
Bulk (Fe2As2)(Sr4(Sc0.6Ti0.4)3O8) shows diamagnetism up to 28 K.
Abstract
We synthesized new layered iron arsenide oxides (Fe2As2)(Sr4(Sc,Ti)3O8),(Fe2As2)(Ba4Sc3O7.5), and (Fe2As2)(Ba3Sc2O5). The crystal structures of these compounds are tetragonal with a space group of I4/mmm. The structure of (Fe2As2)(Sr4(Sc,Ti)3O8) and (Fe2As2)(Ba4Sc3O7.5) consists of the alternate stacking of antifluorite Fe2As2 layers and triple perovskite-type oxide layers. The interlayer distance between the Fe planes of (Fe2As2)(Ba4Sc3O7.5) is ~18.7 A. Moreover, the a-axis of (Fe2As2)(Ba3Sc2O5) is the longest among the layered iron pnictides, indicating the structural flexibility of the layered iron pnictide containing perovskite-type layers. The bulk sample of (Fe2As2)(Sr4(Sc0.6Ti0.4)3O8) exhibited diamagnetism up to 28 K in susceptibility measurements.
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