Structure, optical and transport measurements on bulk magnetic semiconductor In1−xMnxSe

Abstract

The compounds In1−xMnxSe (x = 0.0, 0.025, 0.05, 0.1 and 0.15) have been prepared by direct fusion method. X-ray powder diffraction measurements have been performed by step scanning mode. All the prepared samples are single phase and have wurtzite hexagonal crystal structure with space group P63/mmc. The crystal structure has been refined by Rietveld method using FULLPROF program. It is found that, the unit cell volume is increases with increasing Mn content which indicates that Mn 2+ ions go to In 3+ ions in the InSe lattice. Also, from the refined values of the crystallite size, it was found that the crystallite size decreases with increasing the Mn content. The energy band gap is calculated from the optical measurements and is found to increase as the Mn content increases. The electrical conductivity and the activation energy decreases with increasing Mn concentration. The coercivities, Hc increases with increasing Mn content. The susceptibility increases with increasing Mn content (x).