Magnetoelastic characteristics and peculiarities of indirect exchange in antiferromagnetic manganese fluoride

Magnetic and magnetoelastic properties of manganese fluoride were studied experimentally. The properties of this crystalline material in the antiferromagnetic range (T < 67°K) are mainly due to indirect exchange interaction between Mn2+ ions through F− ions. Most attention was paid in this study to establishing a relation between such an interaction and the interatomic distances. It has been revealed that the exchange interaction energy decreases as R−14 with increasing minimum distance between Mn2+ and F− ions. The test results conform to the simple cosine-law relating the energy and the angle between the bond lines in Mn2 - F−-Mn2+ chains. This relation agrees with the concept of interaction intensity due to a dumb-bell p state of the electron shell in F− ions.

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