We report the synthesis and characterization of a bulk diluted magnetic semiconductor (La1-xBax)(Zn1-xMnx)AsO (0 <= x <= 0.2) with a layered crystal structure identical to that of the "1111" FeAs superconductors. No ferromagnetic order occurs for (Zn,Mn) substitution in the parent compound LaZnAsO without charge doping. Together with carrier doping via (La,Ba) sub- stitution, a small amount of Mn substituting for Zn results in ferromagnetic order with TC up to ~40 K, although the system remains semiconducting. Muon spin relaxation measurements confirm the development of ferromagnetic order in the entire volume, with the relationship between the internal field and TC consistent with the trend found in (Ga,Mn)As, the "111" Li(Zn,Mn)As, and the "122" (Ba,K)(Zn,Mn)2As2 systems.
@article{arxiv.1306.4444,
title = {(La1-xBax)(Zn1-xMnx)AsO: A Two Dimensional "1111" Diluted Magnetic Semiconductor in Bulk Form},
author = {Cui Ding and Huiyuan Man and Chuan Qin and Jicai Lu and Yunlei Sun and Quan Wang and Biqiong Yu and Chunmu Feng and T. Goko and C. J. Arguello and L. Liu and B. J. Frandsen and Y. J. Uemura and Hangdong Wang and H. Luetkens and E. Morenzoni and W. Han and C. Q. Jin and T. Munsie and T. J. Williams and R. M. D'Ortenzio and T. Medina and G. M. Luke and T. Imai and F. L. Ning},
journal= {arXiv preprint arXiv:1306.4444},
year = {2013}
}
Comments
Accepted for publication in Physical Review B-Rapid Communications