Observation of magnetic-field-induced ferroelectricity in a compound CaFe₃O(PO₄)₃
Abstract
Geometrically frustrated kagome materials reveal many novel states of matter ranging from quantum spin liquids to multiferroics. Herein, we study the compound CaFe₃O(PO₄)₃, which has a quasi-two-dimensional lattice of Fe³⁺ ions with spin S = 5/2. Electrical and magnetic properties have been investigated on polycrystalline specimens of CaFe₃O(PO₄)₃ using magnetization, pyroelectric, and magnetoelectric current measurements. The system undergoes a weak ferromagnetic-type ordering at TC1 ∼ 19.5 K, followed by another transition at TC2 ∼ 9 K. While no ferroelectric polarization (P) is observed at a zero magnetic field (H), the applied H induces P below TC2. At the temperature of 2.5 K, P starts to increase above H of 1 T, shows a maximum value at 3.15 T, and then decreases at higher H regions. The observed results suggest that CaFe₃O(PO₄)₃ should be a magnetic-field-induced ferroelectric compound with frustrated magnetic couplings. Show more
Publication status
publishedExternal links
Journal / series
Journal of Applied PhysicsVolume
Pages / Article No.
Publisher
American Institute of PhysicsSubject
Antisymmetric exchange; Ferroelectricity; Magnetic materials; Magnetic ordering; Magnetic susceptibility; Multiferroics; Kagome lattices; Magnetic fieldsOrganisational unit
03903 - Spaldin, Nicola A. / Spaldin, Nicola A.
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