Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity
Figure 35
Magnetic phase diagram of ErMnO3 in -axis fields up to 140 kOe. The phase boundaries are defined by distinct anomalies of the magnetic dc and ac susceptibilities, and , as functions of temperature and field, as well as from the kink anomalies of the dielectric constant . The dashed lines are a guide for the eye. The inset shows the low-temperature section on an enlarged scale (note the different scales for the low and high fields). The red dotted line shows the additional phase boundary proposed by Meier et al. [186]. The blue dotted line shows the minimum of in the high-field section. The labels for the different phases, AFM, FM, FIM1, and FIM2, are the same as used in [186].
