Helimagnetism in mnbi2se4 driven by spin-frustrating interactions between antiferromagnetic chains

Judith K. Clark; Chongin Pak; Huibo Cao; Michael Shatruk

doi:10.3390/cryst11030242

Helimagnetism in mnbi₂se₄ driven by spin-frustrating interactions between antiferromagnetic chains

Judith K. Clark, Chongin Pak, Huibo Cao, Michael Shatruk

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

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.

Original language	English
Article number	242
Pages (from-to)	1-9
Number of pages	9
Journal	Crystals
Volume	11
Issue number	3
DOIs	https://doi.org/10.3390/cryst11030242
State	Published - Mar 2021

Funding

This research was supported by the National Science Foundation (DMR-1905499). The Rigaku Synergy-S single-crystal X-ray diffractometer used for crystallographic work was acquired through the NSF MRI program (award CHE-1828362). J.K.C. acknowledges the support from the DOE Office of Science Graduate Student Research (SCGSR) Fellowship. Acknowledgments: The neutron diffraction experiments used resources at the High Flux Isotope Reactor, U.S. Department of Energy (DOE) Office of Science User Facility operated by the Oak Ridge National Laboratory. This research also used resources provided by the X-ray Crystallography Center (FSU075000XRAY) and the Materials Characterization Laboratory (FSU075000MAC) at the FSU Department of Chemistry and Biochemistry.

Funders	Funder number
DOE Office of Science Graduate Student Research
FSU Department of Chemistry and Biochemistry
SCGSR
X-ray Crystallography Center	FSU075000XRAY
National Science Foundation	CHE-1828362, DMR-1905499
U.S. Department of Energy
Office of Science
Oak Ridge National Laboratory

Keywords

Helimagnet
Magnetic structure
Neutron diffraction
Spin frustration

Access to Document

10.3390/cryst11030242

Cite this

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title = "Helimagnetism in mnbi2se4 driven by spin-frustrating interactions between antiferromagnetic chains",

abstract = "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 TN = 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.",

keywords = "Helimagnet, Magnetic structure, Neutron diffraction, Spin frustration",

author = "Clark, {Judith K.} and Chongin Pak and Huibo Cao and Michael Shatruk",

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AU - Clark, Judith K.

AU - Pak, Chongin

AU - Cao, Huibo

AU - Shatruk, Michael

PY - 2021/3

Y1 - 2021/3

N2 - 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 TN = 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.

AB - 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 TN = 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.

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