稀磁半导体(BaNa)(ZnMn)2As2中的散铁磁性研究

 (Asperomagnetic order in diluted magnetic semiconductor (Ba,Na)(Zn,Mn)2As2

G. X. Gu, G. Q. Zhao, C. J. Lin, Y. Q. Li, C. Q. Jin and G. Xiang

Appl. Phys. Lett. 112, 032402 (2018)

  

We report an investigation of magnetic ordering in (Ba,Na)(Zn,Mn)2As2 (BNZMA) single crystals, a type of II-II-V magnetic semiconductor based on BaZn2As2, with a combination of magnetic, electron transport, and spin polarization measurements. At temperatures above 90 K, the susceptibility is found to follow the Curie-Weiss law with a Curie-Weiss temperature of 16 K. At low temperatures, both the dc and ac susceptibilities exhibit spin-glass-like features and the electron spin polarization is determined to be 48±8% using Andreev reflection spectroscopy. Our experimental results suggest that the ground state of BNZMA has an asperomagnetic order, an intermediate regime between a ferromagnet and a canonical spin glass. Such a partially spin polarized glassy phase can be attributed to the competition between the short range antiferromagnetic superexchange interaction and the long range ferromagnetic/antiferromagnetic exchange interactions mediated by high-density holes.