Magnetodielectric coupling in a triangular Ising lattice: Experiment and modeling

2008/02/08 by N. Bellido, Natalia Bellido, Ch. Simon +3
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.77.054430

arxiv created 2008/02/08 · openalex publication_date 2008/02/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Dielectric constant measurement under magnetic field is an efficient technique to study the coupling between charges and spins in insulating materials. For magnetic oxides, the geometric frustration is known to be a key ingredient to observe such a coupling. Measurements for the triangular Ising-like cobaltite Ca₃Co₂O₆ have been made. Single crystals of Ca₃Co₂O₆ are found to exhibit a magnetodielectric effect below T_N=25\phantom\rule0.3em0exK with a peak in the \ensuremathε(H) curve at the ferri to ferromagnetic transition. This relation between \ensuremathε and magnetization has been modelized by using two order parameters in an energy expansion derived from the Landau formalism and the fluctuation-dissipation theorem. This result emphasizes the great potential of insulating transition metal oxides for the search of magnetodielectric effect.

Citations

• Inversion-symmetry breaking in the noncollinear magnetic phase of the triangular-lattice antiferromagnetCuFeO2
• Anisotropic susceptibility of the geometrically frustrated spin-chain compound Ca3Co2O6
• Why Are There so Few Magnetic Ferroelectrics?
• Magnetodielectric Effects from Spin Fluctuations in Isostructural Ferromagnetic and Antiferromagnetic Systems
• Revival of the magnetoelectric effect
• Specific heat and magnetization study on single crystals of the frustrated quasi-one-dimensional oxideCa3Co2O6