Structural and magnetoelectric interactions of (Ca, Mg)-doped polycrystalline multiferroic CuFeO< sub> 2

T. Elkhouni (1) , M. Amami (1) , Claire Colin (2) , A. Ben Salah (1)

1 SME - Laboratoire de sciences des matériaux et de l’environnement [Université de Sfax]
2 NEEL - MRS - Matériaux, Rayonnements, Structure

In this work, we investigate crystal structure of delafossite-type oxide CuFe1−x(Ca, Mg)xO2 (0 ≤ x ≤ 0.04). It's known to induce a distortion in the structure, there is an important variation in the two lattice parameters a and c because of the big substitution of biunique radius of Ca2+ and Mg2+ (rCa2+ = 1 Å, rMg2+ = 0.74 Å). Magnetic susceptibility measurements show a magnetic dilution for Ca-doped simples and an amplification of χ with Mg-doping. Temperature dependence of the dielectric permittivity for CuFe1−xMgxO2 present an amplification of ϵ′ at TN2 = 9.1 K

Mots clés: Oxides; Raman Spectroscopy; Magnetic properties; delafossite

Domaines: Electrons fortement corrélés [cond-mat.str-el]

T. Elkhouni, M. Amami, Claire Colin, A. Ben Salah. Structural and magnetoelectric interactions of (Ca, Mg)-doped polycrystalline multiferroic CuFeO< sub> 2. Materials Research Bulletin, 2014, 53, pp.151-157. ⟨10.1016/j.materresbull.2014.01.035⟩. ⟨hal-00972262⟩