Magnetic structure studies at Brookhaven National Laboratory

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Abstract
The present communication reports the results of several investigations of magnetic structure and magnetic transitions currently in progress or recently completed at Brookhaven National Laboratory. 1°- The intermetallic compound Ni5Er possesses a uniaxial ferromagnetic structure ; the magnetic scattering is consistent with the assignment of essentially zero moment to the nickel, as suggested by measurements of the saturation magnetization. 2°- The compound MnSn2 has been shown to exhibit a sharp transition from an antiferromagnetic structure to one in which the magnitude of the antiferromagnetically coupled moments exhibits a sinusoïdal spatial modulation. The effect of partial substitution of tin by indium is described. 3°- Results of a study of the temperature dependence of the antiferromagnetic reflections of MnSe2, undertaken at the suggestion of J. O. Dimmock, are compared with predictions based on the Landau-Lifshitz theory of second-order phase transitions. 4°- The magnetic structure of Cr2O3 has been reinvestigated, using both single crystals and powdered specimens, and is discussed in relation to current ideas and suggestions in the literature