Superconductivity around quantum critical point in P-doped iron arsenides



Publication Details

Cao, G., Jiang, S., Wang, C., Li, Y., Ren, Z., Tao, Q., Dai, J. & Xu, Z. (2010). Superconductivity around quantum critical point in P-doped iron arsenides. Physica C: Superconductivity and its Applications, 470 (Suppl.1), S458-S459.


We demonstrate that, by the P/As substitution—without doping of charge carriers—in a FeAs-layer-based parent compound, superconductivity can be universally introduced. The maximum superconducting critical temperature (Tc) of BaFe2(As1-xPx)2 achieves 30 K. The P doping in LnFeAsO system (Ln = La and Sm) produces superconductivity below 11 K. The normal-state resistivity obeys linear temperature dependence and the normal-state Hall coefficient shows strong temperature dependence. These non-Fermi liquid behaviors suggest magnetic quantum criticality. The maximum Tc values in different systems correlates strongly with the diagonal bondangle of Fe–As–Fe, implying the important role of the next-nearest- neighbor magnetic exchange coupling in iron pnictide superconductors.

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