Introducing the monoclinic polymorph of the Kitaev magnet Na$_{2}$Co$_{2}$TeO$_{6}$

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 Na $_{2}$ Co $_{2}$ TeO $_{6}$ 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 Na $_{2}$ Co $_{2}$ TeO $_{6}$ , also with honeycomb layered structure but with a single AFM transition at 9.6 K and without spin reorientation transitions at lower temperatures. 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 6 T.

Introducing the monoclinic polymorph of the Kitaev magnet Na $_{2}$ Co $_{2}$ TeO $_{6}$

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Introducing the monoclinic polymorph of the Kitaev magnet Na $_{2}$ Co $_{2}$ TeO $_{6}$

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Introducing the monoclinic polymorph of the Kitaev magnet Na22​Co22​TeO66​

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Introducing the monoclinic polymorph of the Kitaev magnet Na22​Co22​TeO66​

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Introducing the monoclinic polymorph of the Kitaev magnet Na $_{2}$ Co $_{2}$ TeO $_{6}$

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Introducing the monoclinic polymorph of the Kitaev magnet Na $_{2}$ Co $_{2}$ TeO $_{6}$

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