Abstract
Neutron diffraction of Mn x Zn 1- x Cr 2 Se 4 ( x =0, 0.05 and 0.1) powder was observed at 4.2 K and 1.3 K. Diffraction pattern as a whole is unchanged and the screw spin structure is preserved in spite of the 10% substitution of Zn by Mn. k 0 , the wave vector representing the screw structure, is independent of temperature but decreases with increasing x . Distortion of the screw spin structure due to an interstitial spin was treated by perturbation. Comparison of the results and the experimental data shows that the change of Cr–Cr exchange interaction due to Mn substitution cannot be ignored compared with Mn–Cr exchange. Several conditions on the Mn–Cr interaction was obtained.
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