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Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo2TeO6
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DOI：10.1103/PhysRevB.111.094434.png)
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Abstract
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We report the systematic synthesis, crystal structure, magnetization, and powder neutron diffraction of single-crystalline and polycrystalline CaCo2TeO6 samples. CaCo2TeO6 crystallizes in an orthorhombic structure with Pnma space group, featuring chains of edge-shared CoO6 octahedra arranged in a honeycomb pattern. Two antiferromagnetic transitions are observed at TN1 = 14.4 K and TN2 = 16.2 K, corresponding to two long-range magnetic orders with propagation vectors of k1 = (0, 0, 0) and k2 = (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)mu B and 2.1(1)mu 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 CaCo2TeO6 may be an ideal candidate for studying frustrated magnetism.
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