Simultaneous Development of Antiferromagnetism and Local Symmetry Breaking in a Kagome Magnet (Co0.45Fe0.55)Sn

Yang, Tsung-Han; Gao, Shang; Zhang, Yuanpeng; Olds, Daniel; Meier, William R.; Stone, Matthew B.; Sales, Brian C.; Christianson, Andrew D.; Zhang, Qiang

doi:10.1021/jacs.4c09387

Title: Simultaneous Development of Antiferromagnetism and Local Symmetry Breaking in a Kagome Magnet (Co_0.45Fe_0.55)Sn

Journal Article · 03 December 2024 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.4c09387 · OSTI ID:2481978

^[1]; Gao, Shang ^[1];

^[1]; Olds, Daniel ^[2]; Meier, William R. ^[1];

^[1]; Sales, Brian C. ^[1]; Christianson, Andrew D. ^[1];

^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

CoSn and FeSn, two kagome-lattice metals, have recently attracted significant attention as hosts of electronic flat bands and emergent physical properties. However, current understandings of their physical properties are limited to knowledge of the average crystal structure. Here, we report the Fe-doping induced coemergence of the antiferromagentic (AFM) order and local symmetry breaking in (Co_0.45Fe_0.55)Sn. Rietveld analysis on the neutron and synchrotron X-ray diffraction data indicates A-type antiferromagnetic order with the moment pointing perpendicular to the kagome layers, associated with the anomaly in the MSn(1)₂Sn(2)₄ (M = Co/Fe) octahedral distortion and the lattice constant c. Reverse Monte Carlo (RMC) modeling of the synchrotron X-ray total scattering results captured the subtle local orthorhombic distortion involving off-axis displacements of Sn(2). Our results indicate that the stable hexagonal lattice above T_N becomes unstable once the A-type AFM order is formed below T_N. Here we argue that the local symmetry breaking has a magnetic origin, since the spatially varied M–Sn(2) bond lengths arise from out-of-plane magnetic exchange coupling J_c via the exchange pathway M–Sn(2)–M. Our study provides comprehensive information on the crystal structure in both long-range scale and local scale, unveiling unique coupling between AFM order, octahedral distortion, and hidden local symmetry breaking.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 2481978

Report Number(s):: BNL--226420-2024-JAAM

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 50 Vol. 146; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Simultaneous Development of Antiferromagnetism and Local Symmetry Breaking in a Kagome Magnet (Co0.45Fe0.55)Sn

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Title: Simultaneous Development of Antiferromagnetism and Local Symmetry Breaking in a Kagome Magnet (Co_0.45Fe_0.55)Sn