Multiferroic phases of Eu1-xYxMnO3

We report on structural, magnetic, dielectric, and thermodynamic properties of Eu1-xYxMnO3 for Y doping levels 0 <= x < 1. This system resembles the multiferroic perovskite manganites RMnO3 (with R=Gd,Dy,Tb) but without the interference of magnetic contributions of the 4f ions. In addition, it offers the possibility to continuously tune the influence of the A-site ionic radii. For small concentrations x <= 0.1 we find a canted antiferromagnetic and paraelectric ground state. For higher concentrations x >= 0.3 ferroelectric polarization coexists with the features of a presumably spiral magnetic phase analogous to the observations in TbMnO3. In the intermediate concentration range around x approximate to 0.2 a multiferroic scenario is realized combining weak ferroelectricity and weak ferromagnetism, presumably due to a conelike magnetic structure.