Физика Низких Температур: Том 47, Выпуск 10 (Октябрь 2021), c. 938-941 ( к оглавлению , назад )
Effect of hydrostatic pressure on the magnetic susceptibility of MnF2 single crystal
A. S. Panfilov and G. E. Grechnev
B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of UkraineKharkiv 61103, Ukraine
Received June 2, 2021, published online August 26, 2021
For the classical antiferromagnet MnF2 with TN ≃ 67 K, the pressure dependence of static magnetic susceptibility χ at T > TN was studied for the first time. The measurements of χ(P) were carried out at fixed temperatures 78, 140, and 300 K using a pendulum-type magnetometer and helium gas pressure P up to 2 kbar. The experimental data on the pressure derivative of magnetic susceptibility, d lnχ/dP, were analyzed within the Curie–Weiss law for χ(T) behavior, yielding estimate of the pressure derivative of paramagnetic Curie temperature dΘ/dP = – (0.31 ± 0.05) K/kbar and value (1/Θ)dΘ/dP = (3.5 ± 0.5) Mbar–1. The obtained experimental result is explained by the volume dependence of superexchange interaction between the magnetic moments of Mn2+ ions.
Key words: MnF2, magnetic susceptibility, superexchange, pressure effect.