Transport properties and superconductivity in $B{a}_{1-x}{M}_{x}F{e}_{2}A{s}_2$ (M=La and K) with double FeAs layers

Abstract

We synthesized the samples $B{a}_{1-x}{M}_{x}F{e}_{2}A{s}_2$ (M=La and K) with $ThC{r}_{2}S{i}_2$-type structure. These samples were systematically characterized by resistivity, thermoelectic power (TEP) and Hall coefficient ($R_H$). $BaF{e}_{2}A{s}_2$ shows an anomaly in resistivity at about 140 K. Substitution of La for Ba leads to a shift of the anomaly to low temperature, but no superconducting transition is observed. Potassium doping leads to suppression of the anomaly in resistivity and induces superconductivity at 38 K as reported by Rotter et al.\cite{rotter}. The Hall coefficient and TEP measurements indicate that the TEP is negative for $BaF{e}_{2}A{s}_2$ and La-doped $BaF{e}_{2}A{s}_2$, indicating n-type carrier; while potassium doping leads to change of the sign in $R_H$ and TEP. It definitely indicates p-type carrier in superconducting $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$ with double FeAs layers, being in contrast to the case of $Ln{O}_{1-x}{F}_{x}FeAs$ with single FeAs layer. A similar superconductivity is also observed in the sample with nominal composition $B{a}_{1-x}{K}_{x}OF{e}_{2}A{s}_2$.

4 pages, 4 figures

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