Self-doping effect and successive magnetic transitions in superconducting Sr2 VFeAsO3

Authors

Guanghan Cao, Zhejiang University
Zhifeng Ma, Zhejiang University
Cao Wang, Zhejiang UniversityFollow
Yunlei Sun, Zhejiang University
Jinke Bao, Zhejiang University
Shuai Jiang, Zhejiang University
Yi Luo, Zhejiang University
Chunmu Feng, Zhejiang University
Yi Zhou, Zhejiang University
Zhi Xie, University Of Science And Technology Of China
Fengchun Hu, University Of Science And Technology Of China
Shiqiang Wei, University Of Science And Technology Of China
I Nowik, Hebrew University of Jerusalem
I Felner, Hebrew University of Jerusalem
Lei Zhang, Chinese Academy Of Sciences
Zhu-An Xu, Zhejiang University
Fu-Chun Zhang, Zhejiang University

RIS ID

69812

Publication Details

Cao, G., Ma, Z., Wang, C., Sun, Y., Bao, J., Jiang, S., Luo, Y., Feng, C., Zhou, Y., Xie, Z., Hu, F., Wei, S., Nowik, I., Felner, I., Zhang, L., Xu, Z. & Zhang, F. (2010). Self-doping effect and successive magnetic transitions in superconducting Sr₂VFeAsO₃. Physical Review B: Condensed Matter and Materials Physics, 82 (10), 104518-1-104518-5.

Abstract

We have studied a quinary Fe-based superconductor Sr₂VFeAsO₃ by the measurements of x-ray diffraction, x-ray absorption, Mössbauer spectrum, resistivity, magnetization, and specific heat. This apparently undoped oxyarsenide is shown to be self-doped via electron transfer from the V³⁺ ions. We observed successive magnetic transitions within the VO₂ layers: an antiferromagnetic transition at 150 K followed by a weak ferromagnetic transition at 55 K. The spin orderings within the VO₂ planes are discussed based on mixed valence of V³⁺ and V⁴⁺.