Abstract
The cooperative Jahn-Teller phase transition in Nickelchromite (NiCr 2O 4) has been studied using the channeling method. The angular dependences of the normalized backscattering yields of 1.5 MeV He ions from a NiCr 2O 4 single crystal close to the [111], [110] and [11 1 ] crystallographic axes has been measured for various temperatures above and below the transition temperature. The standard backscattering geometry utilizing an annular detector was employed. Significant changes in the minimum yields and the widths of the angular dependences were found, as well as changes in the angles between the axes. The phase transition temperature of the crystal has been measured.
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