Anomaly in Nonlinear Magnetoelectric Response of YbMnO3
  We observe a seemingly complex magnetic field dependence of dielectric constant of hexagonal YbMnO3 near the spin ordering temperature. After rescaling, the data taken at different temperatures and magnetic fields collapse on a single curve describing the sharp anomaly in nonlinear magnetoelectric response at the magnetic transition. We show that this anomaly is a result of the competition between two magnetic phases. The scaling and the shape of the anomaly are explained using the phenomenological Landau description of the competing phases in hexagonal manganites. 
U. Adem, M. Mostovoy, N. Bellido, A. A. Nugroho, Ch. Simon, and T. T.   M. Palstra