1306.4444 (Cui Ding et al.)

(La1-xBax)(Zn1-xMnx)AsO: A Two Dimensional "1111" Diluted Magnetic
Semiconductor in Bulk Form    [PDF]

Cui Ding, Huiyuan Man, Chuan Qin, Jicai Lu, Yunlei Sun, Quan Wang, Biqiong Yu, Chunmu Feng, T. Goko, C. J. Arguello, L. Liu, B. J. Frandsen, Y. J. Uemura, Hangdong Wang, H. Luetkens, E. Morenzoni, W. Han, C. Q. Jin, T. Munsie, T. J. Williams, R. M. D'Ortenzio, T. Medina, G. M. Luke, T. Imai, F. L. Ning

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.

View original: http://arxiv.org/abs/1306.4444