Superconductivity in LaFeAs1-xPxO: effect of chemical pressures and bond covalency

Authors

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

RIS ID

69990

Publication Details

Wang, C., Jiang, S., Tao, Q., Ren, Z., Li, Y., Li, L., Feng, C., Dai, J., Cao, G. & Xu, Z. (2009). Superconductivity in LaFeAs1-xPxO: effect of chemical pressures and bond covalency. Europhysics Letters: a letters journal exploring the frontiers of physics, 86 (4), 47002-p1-47002-p5.

Abstract

We report the realization of superconductivity by an isovalent doping with phosphorus in LaFeAsO. X-ray diffraction shows that, with the partial substitution of P for As, the Fe2As2 layers are squeezed while the La2O2 layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at ∼ 10K for the optimally doped LaFeAs1−xPxO (x=0.25–0.3). The upper critical field at zero temperature is estimated to be 27T, much higher than that of the LaFePO superconductor. The occurrence of superconductivity is discussed in terms of chemical pressures and bond covalency