Rotomagnetic couplings influence on the magnetic properties of antiferrodistortive antiferromagnets

Abstract

Within the framework of Landau-Ginzburg-Devonshire (LGD) phenomenological theory we consider the possibility to control properties of paraelectric antiferromagnets via biquadratic rotomagnetic coupling with and without external magnetic and electric field application. We use EuTiO3 as a prototype with relatively well-known material parameters. Surprisingly strong influence of this coupling practically on all the properties without external fields was obtained in the temperature region with coexistence of antiferromagnetic and antiferrodistorted phases i.e. in multiferroic state. In particular, the observed Neel temperature TN (5.5 K) was shown to be defined by rotomagnetic coupling, while without this coupling TN appeared to be much higher (26 K). For small or high enough rotomagnetic coupling constant value the antiferromagnetic phase transition order appeared to be the second or the first order respectively. The essential influence of rotomagnetic coupling on the form and value of magnetic and dielectric permittivity was also forecasted. The rotomagnetic coupling along with rotoelectric one opens the additional way to control the form of the phase diagrams by application of external magnetic or electric field. The critical value of the electric field (for antiferromagnetic to ferromagnetic phase transition) appeared essentially smaller than the one calculated without rotomagnetic coupling that can be important for applications.

19 pages, 7 figures, 1 table and supplement

References in corpus (11)

• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Turning ABO${}_3$ antiferroelectrics into ferroelectrics: Design rules for practical rotation-driven ferroelectricity in double perovskites and A${}_3$B${}_2$O${}_7$ Ruddlesden-Popper compounds
• Bulk magnetoelectricity in the hexagonal manganites and ferrites
• Antiferrodistortive phase transition in EuTiO3
• Reversible Control of Magnetic Interactions by Electric Field in a Single Phase Material
• First-principles prediction of oxygen octahedral rotations in perovskite-structure EuTiO3
• Intrinsic Structural Disorder and the Magnetic Ground State in Bulk EuTiO3
• Magnetic field enhanced structural instability in EuTiO_{3}
• New multiferroics based on EuxSr1-xTiO3 nanotubes and nanowires
• Low-symmetry monoclinic phase stabilized by oxygen octahedra rotations in thin strained EuxSr1-xTiO3 films
• Linear roto-antiferromagnetic effect in multiferroics: physical manifestations

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