Ba(Zn,Co)2As2 : A diluted ferromagnetic semiconductor with n -type carriers and isostructural to 122 iron-based superconductors

• DOI: 10.1103/physrevb.99.155201
• Publication Date: 2019-04-02T08:50:06Z
• Authors: Shengli Guo; Huiyuan Man; Kai Wang; Cui Ding; Yao Zhao; Licheng Fu; Yilun Gu; Guoxiang Zhi; Benjamin A. Frandsen; Sky C. Cheung; Zurab Guguchia; Kohtaro Yamakawa; Bin Chen; Hangdong Wang; Z. Deng; C. Q. Jin; Yasutomo J. Uemura; Fanlong Ning
• Keywords: 0103 physical sciences; 01 natural sciences

We report the successful synthesis of a 122 diluted ferromagnetic semiconductor with $n$-type carriers, $\mathrm{Ba}{(\mathrm{Zn},\mathrm{Co})}_{2}{\mathrm{As}}_{2}$. Magnetization measurements show that the ferromagnetic transition occurs up to ${T}_{C}\ensuremath{\sim}45\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Hall effect and Seebeck effect measurements jointly confirm that the dominant carriers are electrons. Through muon spin relaxation, a volume-sensitive magnetic probe, we have also confirmed that the ferromagnetism in $\mathrm{Ba}{(\mathrm{Zn},\mathrm{Co})}_{2}{\mathrm{As}}_{2}$ is intrinsic and the internal field is static.