(Sr,Na)(Zn,Mn)2As2: A new diluted ferromagnetic semiconductor with the hexagonal CaAl2Si2 type structure
B. J. Chen, K. Zhao, Z. Deng, W. Han, J. L. Zhu, X. C. Wang, Q. Q., Liu, B. Frandsen, L. Liu, S. Cheung, F. L. Ning, T.J.S. Munsie, T. Medina,, G.M. Luke, J.P. Carl, J. Munevar, Y. J. Uemura, C. Q. Jin
TL;DR
This paper reports a new diluted ferromagnetic semiconductor, (Sr,Na)(Zn,Mn)2As2, with a hexagonal structure and a Curie temperature up to 20 K, offering insights into ferromagnetism in DMS materials.
Contribution
It introduces a novel DMS with decoupled charge and spin doping and a unique hexagonal structure, distinct from previous similar materials.
Findings
Ferromagnetism observed with Tc up to 20 K.
Decoupled charge and spin doping demonstrated.
Distinct exchange interactions suggested by muon spin relaxation.
Abstract
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.
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