Magnetism

Magnetic properties of Rb$_2$KFeF$_6$

A. D. Balaev, V. N. Voronov, V. M. Sosnin, D. A. Balaev

L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia

Abstract: The static magnetic properties of the Rb$_2$KFeF$_6$ single crystal in the temperature range $T$ = 1.8–300 K in magnetic fields H up to 90 kOe are investigated. At $T>$ 1.8 K the crystal is not magnetically ordered, however, the behavior of the inverse susceptibility $\chi^{-1}(T)$ indicates a negative paramagnetic Curie temperature of $\Theta\approx$ -0.8 K. This is consistent with the analysis of the magnetization curve $H_{\mathrm{eff}}$ by replacing the external field with an effective Heff field with a negative molecular field constant.

Keywords: Rb$_2$KFeF$_6$ single crystal, magnetic properties, negative magnetic interactions.

Received: 10.07.2023
Revised: 10.07.2023
Accepted: 16.07.2023

DOI: 10.21883/FTT.2023.09.56252.143

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