Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity
Figure 24
Magnetostriction of the -axis of HoMnO3 in longitudinal magnetic fields, . Note that different curves are vertically offset for better clarity. (a) High-temperature range. The vertical dashed lines mark the two phase transitions from to and to . (b) Low-temperature range. The inset to (b) shows the derivative at 3 K which clearly reveals 4 successive phase transitions.