Magnetic properties of the Mn1.9 − x Co x Ge compounds with a hexagonal crystal structure
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Concentrational dependences of the lattice parameters, spontaneous magnetic moment, and magnetic ordering temperature of nonstoichiometric Mn1.9 − x Co x Ge (0.8 < x < 1.65) compounds with a hexagonal crystal structure of the Ni2In type have been studied. As the Co content (x) increases from 1.1 to 1.2, the Curie temperature and magnetic moment were found to increase abruptly. The magnetization curves measured for oriented single crystals indicate the presence of a concentrational spin-reorientation transition in this system. The experimental data obtained are discussed taking into account the results of energy-band electronic-structure calculations.
PACS numbers75.50.Cc 75.30.Kz
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