Magnetic Phase Diagram of Rb₂MnBr₄·2H₂O

Abstract

The magnetic phase diagrams of Rb2MnBr4·2H2O with the magnetic field parallel and perpendicular to the preferred spin direction are presented. The Néel temperature is (3.35 ± 0.03) K, and the triple point is at T3 = 2.5 K and H3 = 2.107 A/m (24 kOe). The exchange field HE and the anisotropy field HA are 1.9·106 A/m (24 kOe) and 1.5·106 A/m (18 kOe) respectively. The data is compared with the predictions of the molecular field theory.