CaCo${}_2$TeO${}_6$: A topochemically prepared 3$d^7$ honeycomb Kitaev magnet

Abstract

We report the magnetic properties of CaCo${}_2$TeO${}_6$ as a Kitaev candidate. CaCo${}_2$TeO${}_6$ was synthesized through a topochemical process, wherein all Na${}^{+}$ ions in Na${}_2$Co${}_2$TeO${}_6$ were replaced with half the amount of Ca${}^{2+}$ ions. This substitution brings the CoO${}_6$ octahedra closer to an approximate cubic symmetry. CaCo${}_2$TeO${}_6$ exhibits antiferromagnetic ordering at $T_N\sim 13$ K, which is lower than $\sim$ 27 K observed for Na${}_2$Co${}_2$TeO${}_6$. 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 CaCo${}_2$TeO${}_6$ 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.

9 pages, 9 figures, accepted in Physical Review B

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Cited by in corpus (4)

• Kitaev Quantum Spin Liquids
• Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO${}_4$
• Ground state and magnetic transitions of the orthorhombic antiferromagnet CaCo${}_2$TeO${}_6$
• Crystalline water intercalation into the Kitaev honeycomb cobaltate Na${}_2$Co${}_2$TeO${}_6$