Balaev A.D.1, Voronov V.N.1, Sosnin V.M.1, Balaev D.A.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: dabalaev@iph.krasn.ru
The static magnetic properties of the Rb2KFeF6 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~-0.8 K. This is consistent with the analysis of the magnetization curve Heff by replacing the external field with an effective Heff field with a negative molecular field constant Keywords: Rb2KFeF6 single crystal, magnetic properties, negative magnetic interactions.
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