Abstract

A crystal of was grown, which has a structure containing V-O-V-O linear chains along the c-axis. There a vanadium ion carries a spin of per ion. The magnetic susceptibility was measured in the region from 2 to 300 K up to 55 kG. The temperature dependence shows a broad maximum around 100 K. This is a characteristic of a 1D antiferromagnet. Fitting to the uniform 1D Heisenberg model is very good in the higher temperature region. This suggests the onset of antiferromagnetic order around 100 K. At 34 K, however, shows a kink followed by a ferromagnetic hump at lower temperature. This suggests some magnetic phase transition. At 2 K a slight hysteresis was observed in the magnetic field dependence. The above behaviour was interpreted as the process of transfer from 1D to weak 3D interaction, according to lowering temperature. Lattice parameters increased with decreasing temperature below 100 K, then showed a hump around 30 K. This anomalous behaviour corresponds to the above magnetic results. It has been concluded that is a one-dimensional antiferromagnet. We also suggest the existence of a weak ferromagnetic ordered state such as canted or ferri-magnetism by the V-O pairs in the lower temperature region.

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