The synthesis and characterization of 1 1 1 1 type diluted ferromagnetic semiconductor (La1−xCax)(Zn1−xMnx)AsO. (17th December 2015)

• Record Type: Journal Article
• Authors: Ding, Cui; Guo, Shengli; Zhao, Yao; Man, Huiyuan; Fu, Licheng; Gu, Yilun; Wang, Zhouyang; Liu, L; Frandsen, B A; Cheung, S; Uemura, Y J; Goko, T; Luetkens, H; Morenzoni, E; Zhao, Yang; Ning, F L
• Is Part Of: Journal of physics. Volume 28:Number 2(2016)
• Publication Date: 2015-12-17
• Subjects: DMS -- ferromagnetic order -- muSR -- carrier doping; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/2/026003
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We report the synthesis and characterization of a bulk form diluted magnetic semiconductor, (La1− x Ca x )(Zn1− y Mn y )AsO, with a layered crystal structure isostructural to that of the 1 1 1 1 type Fe-based high-temperature superconductor LaFeAsO and the antiferromagnetic LaMnAsO. With Ca and Mn codoping into LaZnAsO, the ferromagnetic ordering occurs below the Curie temperature ∼30 K. Taking advantage of the decoupled charge and spin doping, we investigate the influence of carrier concentration on the ferromagnetic ordering state. For a fixed Mn concentration of 10%, increases from 24 K to 30 K when the Ca concentration increases from 5% to 10%. Further increase of Ca concentration reduces both the coercive field and saturation moment. Muon spin relaxation measurements confirm the ferromagnetically ordered state, and clearly demonstrate that (La1− x Ca x )(Zn1− y Mn y )AsO shares a common mechanism for the ferromagnetic exchange interaction with (Ga, Mn)As. Neutron scattering measurements show no structural transition in (La0.90 Ca0.10 )(Zn0.90 Mn0.10 )AsO below 300 K.