Magnetic properties driven by local structure in quasi-1D Ising chain system cobaltate system

Using {\it ab-initio} band structure method and the microscopic model calculation, the origins of the large orbital magnetic moment and unique magnetic anisotropy in the quasi-1D magnetic cobaltate, $\alpha$-CoV$_{2}$O$_{6}$, is investigated. Unique crystal electric field effect in $\alpha$-CoV$_{2}$O$_{6}$ is combined with the strong spin-orbit coupling, results in intriguing magnetic properties of the system. Based on the estimated strengths of the intra- and the inter-chain exchange interaction, experimentally found 1/3 magnetization plateau in the $MH$ curve can be attributed to spin-flop mechanism. Origin of the reduced magnetic entropy behavior is found to be the strong uniaxial magnetic anisotropy in the quasi-1D Ising chain system.