Phase transitions and colossal magnetoresistance in $\mathrm{CuV_xCr_{1-x}S_2}$ layered disulfides

New substances CuV_xCr_1−x S₂ are synthesized in which colossal magnetoresistance (T _C = 95 K, δ_H = −60%, H = 7 kOe), as well as the sequence of phase transitions with change in the conduction type and magnetic order, is observed as temperature is varied. The change found in the magnetic and electric properties of the CuV_xCr_1−x S₂ compounds may be a~consequence of a~specific disintegration into Cu⁺Cr³⁺S₂ and Cu²⁺Cr²⁺S₂ and a~change in the concentration relation between these electronic phases in the substance bulk.