Introducing the monoclinic polymorph of the honeycomb magnet Na2Co2TeO6

Dufault, Emilie; Bahrami, Faranak; Streeter, Alenna; Yao, Xiaohan; Gonzalez Delgado, Enrique; Zhang, Qiang; Tafti, Fazel

doi:10.1103/physrevb.108.064405

Introducing the monoclinic polymorph of the honeycomb magnet Na2 Co2 TeO6

Journal Article · Mon Aug 07 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.064405· OSTI ID:1999007

Dufault, Emilie ^[1]; ^[1]; Streeter, Alenna ^[1]; ^[1]; ^[1]; ^[2]; ^[1]

Boston College, Chestnut Hill, MA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Recent theoretical studies have suggested that the low-energy Hamiltonian of honeycomb cobaltate systems could be dominated by anisotropic Kitaev interactions. Motivated by the theory, a honeycomb layered material Na₂Co₂TeO₆ with a hexagonal unit cell has been studied and found to exhibit antiferromagnetic (AFM) ordering at 27 K with two spin reorientation transitions at 15 and 5 K. Here we report a monoclinic polymorph of Na₂Co₂TeO₆, also with honeycomb layered structure but with a single AFM transition at 9.6 K and without spin reorientation transitions at lower temperatures. Here, using neutron diffraction, we identify an in-plane zigzag AFM order in the ground state with the spins canted out of the honeycomb planes and ferromagnetically coupled between them. The zigzag order is suppressed by a magnetic field of 6T. The lower critical temperature and field, positive Curie-Weiss temperature, and out-of-plane canting of spins in the monoclinic Na₂Co₂TeO₆ suggest enhanced frustration in this polymorph compared to the hexagonal one.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1999007

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Introducing the monoclinic polymorph of the honeycomb magnet Na2 Co2 TeO6

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