Large off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet

Xianghan Xu (), Yiqing Hao, Shiyu Peng, Qiang Zhang, Danrui Ni, Chen Yang, Xi Dai, Huibo Cao and R. J. Cava ()
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Xianghan Xu: Princeton University
Yiqing Hao: Oak Ridge National Laboratory
Shiyu Peng: Hong Kong University of Science and Technology
Qiang Zhang: Oak Ridge National Laboratory
Danrui Ni: Princeton University
Chen Yang: Princeton University
Xi Dai: Hong Kong University of Science and Technology
Huibo Cao: Oak Ridge National Laboratory
R. J. Cava: Princeton University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Magnetic toroidicity is an uncommon type of magnetic structure in solid-state materials. Here, we experimentally demonstrate that collinear spins in a material with R-3 lattice symmetry can host a significant magnetic toroidicity, even parallel to the ordered spins. Taking advantage of a single crystal sample of CoTe6O13 with an R-3 space group and a Co2+ triangular sublattice, temperature-dependent magnetic, thermodynamic, and neutron diffraction results reveal A-type antiferromagnetic order below 19.5 K, with magnetic point group -3′ and k = (0,0,0). Our symmetry analysis suggests that the missing mirror symmetry in the lattice could lead to the local spin canting for a toroidal moment along the c axis. Experimentally, we observe a large off-diagonal magnetoelectric coefficient of 41.2 ps/m that evidences the magnetic toroidicity. In addition, the paramagnetic state exhibits a large effective moment per Co2+, indicating that the magnetic moment in CoTe6O13 has a significant orbital contribution. CoTe6O13 embodies an excellent opportunity for the study of next-generation functional magnetoelectric materials.

Date: 2023
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DOI: 10.1038/s41467-023-43858-z

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