Structure and Physical properties of New layered oxypnictides $Sr_4Sc_2O_6M_2As_2$ (M=Fe and Co)

Details Structure and Physical properties of New layered oxypnictides $Sr_4Sc_2O_6M_2As_2$ (M=Fe and Co) Structure and Physical properties of New layered oxypnictides $Sr_4Sc_2O_6M_2As_2$ (M=Fe and Co)

2009-03-31

arxiv.org/abs/0903.5484v1

EPL 86 (2009) 57007

Physics

Condensed Matter

Superconductivity

9 pages; 4 figures

Scientific paper

We have successfully prepared the new layered oxypnictides $Sr_4Sc_2O_6M_2As_2$ (M=Fe and Co). They adopt the tetragonal structure, being the same as that of $Sr_4Sc_2O_6Fe_2P_2$. The lattice constants are a=0.4045 nm and c= 0.5802 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 Hall coefficient and thermoelectric powder for $Sr_4Sc_2O_6Fe_2As_2$ compound show complicated behavior, similar to that of iron-based parent compounds LnOFeAs and $BaFe_2As_2$. It suggests that the $Sr_4Sc_2O_6Fe_2As_2$ could be considered a new parent compound as iron-based superconductors.

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