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; R. J. Cava

doi:10.1038/s41467-023-43858-z

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, R. J. Cava

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

1 Scopus citations

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.

Original language	English
Article number	8034
Journal	Nature Communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-43858-z
State	Published - Dec 2023

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).

Funding

X.X., D.N., C.Y., and R.J.C. acknowledge the NSF-MRSEC Grant No. DMR-2011750 for supporting the work at Princeton University. Y.H. and H.C. acknowledge the support from the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract No. DE-AC05-00OR22725. This research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, the DOE Office of Science User Facility operated by ORNL. X.X., D.N., C.Y., and R.J.C. acknowledge the NSF-MRSEC Grant No. DMR-2011750 for supporting the work at Princeton University. Y.H. and H.C. acknowledge the support from the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract No. DE-AC05-00OR22725. This research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, the DOE Office of Science User Facility operated by ORNL.

Funders	Funder number
NSF-MRSEC	DMR-2011750
Spallation Neutron Source
U.S. Department of Energy
Office of Science
Basic Energy Sciences	DE-AC05-00OR22725, KC0402020
Oak Ridge National Laboratory
Princeton University

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10.1038/s41467-023-43858-z

Cite this

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title = "Large off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet",

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.",

author = "Xianghan Xu and Yiqing Hao and Shiyu Peng and Qiang Zhang and Danrui Ni and Chen Yang and Xi Dai and Huibo Cao and Cava, {R. J.}",

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AU - Xu, Xianghan

AU - Hao, Yiqing

AU - Peng, Shiyu

AU - Zhang, Qiang

AU - Ni, Danrui

AU - Yang, Chen

AU - Dai, Xi

AU - Cao, Huibo

AU - Cava, R. J.

PY - 2023/12

Y1 - 2023/12

N2 - 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.

AB - 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.

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