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Multiferroism in the dielectric function of CuO
Author(s) -
Apostolova I. N.,
Apostolov A. T.,
Bahoosh S. G.,
Wesselinowa J. M.,
Trimper S.
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201308093
Subject(s) - condensed matter physics , multiferroics , dielectric , dielectric function , coupling (piping) , anomaly (physics) , frustration , magnetic field , function (biology) , field (mathematics) , phase transition , physics , materials science , dielectric response , ferroelectricity , quantum mechanics , mathematics , composite material , evolutionary biology , biology , pure mathematics
The multiferroic properties of bulk CuO are manifested in the dielectric function which can be triggered by an external magnetic field h and by the temperature T . Within a microscopic model and a Green's function technique we have calculated the dielectric function \varepsilon ({\bf k};T,\;h). At the magnetic phase transition temperature T_{{\rm N}2} the dielectric function offers a pronounced anomaly. This kink disappears when the magnetic field is enhanced and \varepsilon ({\bf k};T,\;h) decreases with increasing h ‐field. Both properties are indications for a strong magnetoelectric coupling in this material. The observation of multiferroism in CuO within an analytical approach is achieved by considering frustration and a linear magnetoelectric coupling. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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