Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo$_2$TeO$_6$

We report the systematic synthesis, crystal structure, magnetization, and powder neutron diffraction of single crystalline and polycrystalline CaCo $_{2}$ TeO $_{6}$ samples. CaCo $_{2}$ TeO $_{6}$ crystallizes in an orthorhombic structure with $P n m a$ space group, featuring chains of edge-shared CoO $_{6}$ octahedra arranged in a honeycomb pattern. Two antiferromagnetic transitions are observed at $T$ $_{N 1}$ = 14.4 K and $T$ $_{N 2}$ = 16.2 K, corresponding to two long-range magnetic orders with propagation vectors of $k$ $_{1}$ = (0, 0, 0) and $k$ $_{2}$ = (0.125, 0, 0.25), respectively. The ground state is determined as a canted up-up-down-down zigzag spin configuration along the $c$ axis, wherein the magnetic moments of Co1 and Co2 ions are 3.4(1) and 2.1(1) $μ$ $_{B}$ , respectively. Successive spin-flop transitions appear with the increasing magnetic field applied along the easy axis ( $c$ axis), accompanied by depression of the antiferromagnetic orders and enhancement of residual magnetic entropy. The field-induced spin-disordered state suggests that CaCo $_{2}$ TeO $_{6}$ may be an ideal candidate for studying frustrated magnetism.

Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo $_{2}$ TeO $_{6}$

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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo $_{2}$ TeO $_{6}$

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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo22​TeO66​

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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo22​TeO66​

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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo $_{2}$ TeO $_{6}$

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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo $_{2}$ TeO $_{6}$

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