NDLI: Helimagnetism in $MnBi_{2}Se_{4}$ Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

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Helimagnetism in $MnBi_{2}Se_{4}$ Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

Content Provider	MDPI
Author	Clark, Judith Pak, Chongin Cao, Huibo Shatruk, Michael
Copyright Year	2021
Description	We report the magnetic properties and magnetic structure determination for a linear-chain antiferromagnet, MnBi2Se4. The crystal structure of this material contains chains of edge-sharing MnSe6 octahedra separated by Bi atoms. The magnetic behavior is dominated by intrachain antiferromagnetic (AFM) interactions, as demonstrated by the negative Weiss constant of −74 K obtained by the Curie–Weiss fit of the paramagnetic susceptibility measured along the easy-axis magnetization direction. The relative shift of adjacent chains by one-half of the chain period causes spin frustration due to interchain AFM coupling, which leads to AFM ordering at T N = 15 K. Neutron diffraction studies reveal that the AFM ordered state exhibits an incommensurate helimagnetic structure with the propagation vector k = (0, 0.356, 0). The Mn moments are arranged perpendicular to the chain propagation direction (the crystallographic b axis), and the turn angle around the helix is 128°. The magnetic properties of MnBi2Se4 are discussed in comparison to other linear-chain antiferromagnets based on ternary mixed-metal halides and chalcogenides.
Starting Page	242
e-ISSN	20734352
DOI	10.3390/cryst11030242
Journal	Crystals
Issue Number	3
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-02-27
Access Restriction	Open
Subject Keyword	Crystals Inorganic Chemistry Magnetic Structure Spin Frustration Helimagnet Neutron Diffraction
Content Type	Text
Resource Type	Article

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