A new diluted ferromagnetic semiconductor (Sr,Na)(Zn,Mn)2As2 is reported, in which charge and spin doping are decoupled via Sr/Na and Zn/Mn substitutions, respectively, being distinguished from classic (Ga,Mn)As where charge & spin doping are simultaneously integrated. Different from the recently reported ferromagnetic (Ba,K)(Zn,Mn)2As2, this material crystallizes into the hexagonal CaAl2Si2-type structure. Ferromagnetism with a Curie temperature up to 20 K has been observed from magnetization. The muon spin relaxation measurements suggest that the exchange interaction between Mn moments of this new system could be different to the earlier DMS systems. This system provides an important means for studying ferromagnetism in diluted magnetic semiconductors.
@article{arxiv.1411.4536,
title = {(Sr,Na)(Zn,Mn)2As2: A new diluted ferromagnetic semiconductor with the hexagonal CaAl2Si2 type structure},
author = {B. J. Chen and K. Zhao and Z. Deng and W. Han and J. L. Zhu and X. C. Wang and Q. Q. Liu and B. Frandsen and L. Liu and S. Cheung and F. L. Ning and T. J. S. Munsie and T. Medina and G. M. Luke and J. P. Carl and J. Munevar and Y. J. Uemura and C. Q. Jin},
journal= {arXiv preprint arXiv:1411.4536},
year = {2014}
}