Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 22, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/22/7/075008
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Funding
- Center for Nano-Lithography and Analysis, The University of Tokyo
- Ministry of Education, Culture, Science and Technology (MEXT), Japan
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A new layered pnictide oxide (Fe2P2)(Sr4Sc2O6) has been synthesized by solid-state reaction. This material has an alternating layer stacking structure of anti-fluorite Fe2P2 and perovskite-based Sr4Sc2O6 oxide layers. The space group of the material is P4/nmm and the lattice constants a and c are 4.016 and 15.543 angstrom, respectively. The interlayer Fe-Fe distance corresponding to the c-axis length is the longest ever reported in the iron-based pnictides. In both magnetization and resistivity measurements, the present compound exhibited superconductivity below 17 K; this temperature is much higher than that for LaFePO and the highest in arsenic-free iron-based pnictide systems under ambient pressure.
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