Possible double magnetic phase transition in image

We have investigated the magnetic and transport properties of image by magnetic susceptibility, electrical resistivity, magnetoresistance and thermoelectric power measurements. The compound crystallises in the hexagonal image-type structure (space group image) and probably undergoes two successive magnetic transitions at image and image. The experimental data are indicative of a ferri- and antiferromagnetic types of the transitions, respectively. We attribute the double magnetic phase transition and the reduction of the magnetisation values at low temperatures to associate with the two non-equivalent magnetic sublattices of the image ions. We observed a large magnetoresistance value of image at temperatures in between image and image. The investigated compound has a negative thermoelectric power of image at 300 K. We interpret the overall behaviour of the image-curve to two different mechanisms: magnetic and charge carrier diffusion.