Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co4Nb2O9: A single-crystal neutron diffraction study

Ding, Lei; Lee, Minseong; Hong, Tao; Dun, Zhiling; Sinclair, Ryan; Chi, Songxue; Agrawal, Harish K.; Choi, Eun Sang; Chakoumakos, Bryan C.; Zhou, Haidong; Cao, Huibo

doi:10.1103/physrevb.102.174443

Title: Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co₄Nb₂O₉: A single-crystal neutron diffraction study

Journal Article · Mon Nov 30 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.174443· OSTI ID:1731059

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^[1]; Dun, Zhiling ^[3]; Sinclair, Ryan ^[3];

^[1]; Agrawal, Harish K. ^[1]; Choi, Eun Sang ^[2];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Florida State Univ., Tallahassee, FL (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Florida State Univ., Tallahassee, FL (United States)

Through an analysis of single-crystal neutron diffraction data, we present the magnetic structure and magnetoelectric properties of Co₄Nb₂O₉ under various magnetic fields. In zero field, neutron diffraction experiments below T_N=27K reveal that the Co²⁺ moments order in the (ab) plane without any spin canting along the c axis, manifested by the magnetic symmetry C2/c'. Along each Co chain parallel to the c axis, the moments of nearest-neighbor Co atoms order ferromagnetically with a small cant away from the next-nearest-neighbor Co moments. Under the applied magnetic field H ∥ a, three magnetic domains were aligned with their major magnetic moments perpendicular to the magnetic field with no other observable magnetic transitions. The influences of magnetic fields on the magnetic structures associated with the observed magnetoelectric coupling are discussed.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; KC0402010; SC-0020254; DMR-1644779

OSTI ID:: 1731059

Journal Information:: Physical Review B, Vol. 102, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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SUPERCONDUCTIVITY AND SUPERFLUIDITY
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Title: Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co4Nb2O9: A single-crystal neutron diffraction study

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Title: Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co₄Nb₂O₉: A single-crystal neutron diffraction study