High-field magnetization and neutron diffraction studies of one-dimensional compound Ca₃CoRhO₆

High-field magnetization and neutron diffraction measurements were performed on the one-dimensional compound Ca₃CoRhO₆. The long-range ordered state was first observed below 90 K. A plateau at 1/3 of the saturation magnetization was observed in the magnetization curve at 70K, indicating ferrimagnetic alignment of the ferromagnetic Ising chains. We also observed a large hysteresis originating from a spin freezing of ferromagnetic chains in the magnetization curve at 4.2 K. Based on the results of high-field magnetization and neutron diffraction measurements, a possible magnetic structure is discussed in terms of the spin frustration on the triangular lattice.