High Temperature Multiferroic State in RBaCuFeO5 (R= Y, Lu and Tm)

Abstract

Magnetic and/or dielectric behaviors have been studied for YBaCuFeO5, LuBaCuFeO5 and TmBaCuFeO5, which are known as members of oxygen-defect ordered perovskite systems RBaCuFeO5 (R=lanthanides Ln and other trivalent elements) and have two magnetic transitions: The magnetic structure of the high temperature(T) ordered phase is basically antiferromagnetic, and with decreasing T, a modulated magnetic component superposed on the antiferromagnetic moments appears at the second transition, where the ferroelectricity also appears (multiferroic). Here, we have found that all the systems studied here exhibit multiferroic behavior in the low T phase, and that TmBaCuFeO5 becomes multiferroic at a temperature as high as the melting point of ice, which is, to our knowledge, the highest value ever found in zero magnetic field.

4 pages, 4 figures, submitted to J. Phys. Soc. Jpn

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• Relationship between Magnetic Structure and Ferroelectricity of LiVCuO4
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• Evolution of magnetic and dielectric properties in Sr-substituted high temperature multiferroic YBaCuFeO5
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• Nature of the spiral state, electric polarisation and magnetic transitions in Sr-doped YBaCuFeO${}_5$: A first-principles study
• Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5
• Magnetic properties of a highly ordered single crystal of the layered perovskite YBaCuFe${}_{0.95}$Mn${}_{0.05}$O${}_5$
• Effect of doping of Co, Ni and Ga on magnetic and dielectric properties of layered perovskite multiferroic YBaCuFeO5
• Low temperature magnetic and dielectric properties of LnBaCuFeO5 (Ln = Nd, Eu, Gd, Ho and Yb)