Volume 86, Number 5, June 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 June 2009|
Structure and physical properties of the new layered oxypnictides Sr4Sc2O6M2As2 (M = Fe and Co)
Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China - Hefei, Anhui 230026, China
Corresponding author: email@example.com
Accepted: 25 May 2009
We have successfully prepared the new layered oxypnictides Sr4Sc2O6M2As2 (M = Fe and Co). They adopt the tetragonal structure, being the same as that of Sr4Sc2O6Fe2P2. The lattice constants are a = 0.4045 nm and c = 1.5802 nm for M = Fe and a = 0.4045 nm and c = 1.5695 nm for M = Co, respectively. Their transport and magnetic properties have been systematically studied. The temperature dependence of the Hall coefficient and the thermoelectric power for the Sr4Sc2O6M2As2 compound show a complicated behavior, similar to that of the iron-based parent compounds LnOFeAs and BaFe2As2. This suggests that Sr4Sc2O6Fe2As2 could be considered as a new parent compound of iron-based superconductors.
PACS: 74.70.-b – Superconducting materials / 74.25.Ha – Magnetic properties / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
© EPLA, 2009
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