CaCo2TeO6: A topochemically prepared 3d7 honeycomb Kitaev magnet
Abstract
We report the magnetic properties of CaCo2TeO6 as a Kitaev candidate. CaCo2TeO6 was synthesized through a topochemical process, wherein all Na+ ions in Na2Co2TeO6 were replaced with half the amount of Ca2+ ions. This substitution brings the CoO6 octahedra closer to an approximate cubic symmetry. CaCo2TeO6 exhibits antiferromagnetic ordering at TN 13 K, which is lower than 27 K observed for Na2Co2TeO6. Notably, its magnetic order is suppressed in a relatively low magnetic field of approximately 4 T, indicating that non-Kitaev interactions can be restrained by reducing trigonal distortion. Our findings highlight the potential of CaCo2TeO6 as a viable platform for exploring Kitaev quantum spin liquids and pave the way for a deeper understanding of the fundamental mechanisms in Kitaev physics.
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