Magnetic Susceptibility of an Antiferromagnetic KCoF₃ Single Crystal—¹⁹F NMR and Static Measurements

Abstract

The temperature dependence of the parallel and perpendicular susceptibilities of an antiferromagnetic KCoF₃ single crystal has been obtained from the shift of ¹⁹F NMR and the static magnetic measurements in both the paramagnetic and antiferromagnetic states. A large residual value of the parallel susceptibility, (4.6±0.1)×10³ emu/mole, is observed even at 4.2 K, which is ascribed to the residual orbital momentum of Co²⁺ ions. The absolute value and the temperature dependence of the susceptibility are in general accord with the theoretical prediction by N. Suzuki, T. Isu and K. Motizuki based on the correlated effective field approximation.