Superconductivity around quantum critical point in P-doped iron arsenides

Authors

Guanghan Cao, Zhejiang University
Shuai Jiang, Zhejiang University
Cao Wang, Zhejiang UniversityFollow
Yuke Li, Zhejiang University
Zhi Ren, Zhejiang University
Qian Tao, Zhejiang University
Jianhui Dai, Zhejiang University
Zhu-An Xu, Zhejiang University

RIS ID

69810

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.

Abstract

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.