Synthesis, structure, and magnetism in the ferromagnet La 3 MnAs 5 : Well-separated spin chains coupled via itinerant electrons

作者：L. Duan, Xiancheng Wang, J. Zhang, Z. Hu, Jianfa Zhao, Yuchao Feng, H. L. Zhang, Huaijun Lin, C. T. Chen, Wei Wu, Zhi Li, Rui Wang, J. F. Zhang, Ting Xiang, Changqing Jin · 发表于：Physical review. B./Physical review. B · 年份：2022 · DOI：10.1103/physrevb.106.184405 · 被引用次数：28 · 研究领域：Iron-based superconductors research、Rare-earth and actinide compounds、Inorganic Chemistry and Materials

In this work, we systematically report the synthesis, structure, and magnetism of a compound of filled anti-${\mathrm{Mn}}_{3}{\mathrm{Si}}_{5}$ type ${\mathrm{La}}_{3}{\mathrm{MnAs}}_{5}$. It crystallizes in a hexagonal structure with the space group of $P{6}_{3}/mcm$ (193). The structure consists of face-sharing ${\mathrm{MnAs}}_{6}$ octahedral chains along the $c$ axis, which are well separated by a large distance of 8.$9913\phantom{\rule{0.28em}{0ex}}\AA{}$, demonstrating a strong one-dimensional (1D) structural character. Physical property measurements indicate that ${\mathrm{La}}_{3}{\mathrm{MnAs}}_{5}$ is a ferromagnetic metal with ${T}_{\mathrm{C}}\ensuremath{\sim}112\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. Due to the short-range intrachain spin coupling, the susceptibility deviates from the Curie-Weiss behavior in a wide temperature window and the magnetic entropy corresponding to the ferromagnetic transition is significantly lower than that expected from the fully saturated state. The magnetic critical behavior studies show that ${\mathrm{La}}_{3}{\mathrm{MnAs}}_{5}$ can be described by the three-dimensional Heisenberg model. The orbital hybridization between the 1D ${\mathrm{MnAs}}_{6}$ chain and intermediate La atom near the Fermi level reveals that the itinerant electrons play a key role in transmitting spin interaction among the ${\mathrm{MnAs}}_{6}$ spin chains. Our results indicate that ${\mathrm{La}}_{3}{\mathrm{MnAs}}_{5}$ is a rare ferromagnetic metal with ...