Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-25
J. Phys. Soc. Jpn. 78 (2009) 053704; erratum, J. Phys. Soc. Jpn. 78 (2009) 1188002
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures. Recalculated results after correcting errors in the assignment of DM vectors. The conclusion is not affect
Scientific paper
10.1143/JPSJ.78.053704, 10.1143/
Magnetoelectric phase diagrams of the perovskite manganites, Eu1-xYxMnO3 and Gd1-xTbxMnO3, are theoretically studied. We first construct a microscopic model, and then analyze the model using the Monte-Carlo method. We reproduce the diagrams, which contain two different multiferroic states, i.e., the ab-plane spin cycloid with electric polarization P//a and the bc-plane spin cycloid with P//c. We reveal that their competition originates from a conflict between the single-ion anisotropy and the Dzyaloshinsky-Moriya interaction, which is controlled by the second-neighbor spin exchanges enhanced by the GdFeO3-type distortion. This leads to a P flop from a to c with increasing x in agreement with the experiments.
Furukawa Nobuo
Mochizuki Masahito
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