Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-19
Supercond. Sci. Technol. 22 (2009) 075008
Physics
Condensed Matter
Superconductivity
6pages, 4 figures
Scientific paper
10.1088/0953-2048/22/7/075008
A new layered oxypnictide (Fe2P2)(Sr4Sc2O6) have been synthesized by solid-state reaction. This material has an alternating layer stacking structure of anti-fluorite Fe2P2 and perovskite-based Sr4Sc2O6 oxide layers. Space group of the material is P4/nmm and lattice constants a and c are 4.016 A and 15.543 A, respectively. The interlayer Fe-Fe distance corresponding to the c-axis length is the longest ever reported in the iron-based oxypnictide systems. In both magnetization and resistivity measurements, the present compound exhibited superconductivity below 17 K, which is much higher than that of LaFePO and the highest in arsenic-free iron-based oxypnictide systems under ambient pressure.
Horii Shigeru
Katsura Yukari
Kishio Kohji
Matsumura Yoichiro
Ogino Hiraku
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