Synthesis, structure, and magnetism in the ferromagnet La3MnAs5: Well-separated 
spin chains coupled via itinerant electrons

Duan, L.; Wang, X. C.; Zhang, J.; Hu, Z.; Zhao, J. F.; Feng, Y. G.; Zhang, H. L.; Lin, H.-J.; Chen, C. T.; Wu, W.; Li, Z.; Wang, R.; Zhang, J. F.; Xiang, T.; Jin, C. Q.

doi:10.1103/PhysRevB.106.184405

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Synthesis, structure, and magnetism in the ferromagnet La₃MnAs₅: Well-separated spin chains coupled via itinerant electrons

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Hu, Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Duan, L., Wang, X. C., Zhang, J., Hu, Z., Zhao, J. F., Feng, Y. G., et al. (2022). Synthesis, structure, and magnetism in the ferromagnet La₃MnAs₅: Well-separated spin chains coupled via itinerant electrons. Physical Review B, 106(18): 184405, pp. 1-12. doi:10.1103/PhysRevB.106.184405.

Cite as: https://hdl.handle.net/21.11116/0000-000C-450C-A

Abstract

In this work, we systematically report the synthesis, structure, and magnetism of a compound of filled anti-Mn3Si5 type La3MnAs5. It crystallizes in a hexagonal structure with the space group of P63/mcm (193). The structure consists of face-sharing MnAs6 octahedral chains along the c axis, which are well separated by a large distance of 8.9913Å, demonstrating a strong one-dimensional (1D) structural character. Physical property measurements indicate that La3MnAs5 is a ferromagnetic metal with TC∼112K. 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 La3MnAs5 can be described by the three-dimensional Heisenberg model. The orbital hybridization between the 1D MnAs6 chain and intermediate La atom near the Fermi level reveals that the itinerant electrons play a key role in transmitting spin interaction among the MnAs6 spin chains. Our results indicate that La3MnAs5 is a rare ferromagnetic metal with well-separated spin chains, which provides a good opportunity to study the mechanism of interchain spin coupling via itinerant electrons. © 2022 American Physical Society.