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Results are presented from a study of the magnetic susceptibility and electron spin resonance (ESR) on Cr3+ and Mn2+ ions in a series of samples of the semimagnetic semiconductor Hg1−x−yCrxMnySe with x=0.02 and 0.01⩽y⩽0.08. The experimental results show that the structure of the ESR spectrum and the character of its shift with respect to magnetic field as the temperature changes depend on the ratio of the concentrations of chromium and manganese ions, which form two interacting substructures. The observed transition of Hg1−x−yCrxMnySe to a spin glass phase is not related to the distortion of the symmetry of the crystal lattice. The shared and distinctive properties of the systems Hg1−xCrxSe and Hg1−x−yCrxMnySe are determined.

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