Magnetic, magnetodielectric, and magnetocaloric properties of new polar oxides RCrWO6 (R = Sm, Eu, Gd, and Tb). (15th September 2022)

• Record Type: Journal Article
• Authors: Panda, Debendra Prasad; Yanda, Premakumar; Behera, Sinay Simanta; Sundaresan, A.
• Is Part Of: Solid state communications. Volume 353(2022)
• Publication Date: 2022-09-15
• Subjects: Aeschynite -- Polar magnet -- Canted antiferromagnet -- Magnetodielectric; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2022.114843
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We report new magnetic oxides R CrWO6 ( R = Sm, Eu, Gd, and Tb) crystallizing in the polar orthorhombic structure (Space Group: Pna 21 ), where edge-shared dimers of CrO6 and WO6 octahedra are connected by sharing corners and establish a three-dimensional framework. All these compounds exhibit antiferromagnetic ordering of Cr 3+ spins at T N ∼ 28–32 K, except SmCrWO6, which shows weak ferromagnetism below T N = 32 K. Isothermal magnetization curves of R CrWO6 ( R = Gd and Tb) at low temperatures show field-induced metamagnetic transition. Further, a dielectric anomaly at T N in all these compounds evidences the magnetodielectric effect. In addition, GdCrWO6 demonstrates magnetocaloric effect (MCE) with a maximum magnetic entropy change of 9.22 J kg −1 K −1 at 70 kOe with relative cooling power (RCP) ∼ 101 J kg -1 . On the other hand, TbCrWO6 exhibits both conventional and inverse magnetocaloric effects with significant entropy change and RCP. Highlights: We have synthesized new polar magnets R CrWO6 ( R = Sm, Eu, Gd, and Tb) crystallizing in the Pna 21 space group. All these compounds exhibit antiferromagnetic ordering of Cr 3+ spins, except SmCrWO6, which shows weak ferromagnetism. All compounds exhibit magnetodielectric effect. GdCrWO6 shows conventional magnetocaloric effect, whereas TbCrWO6 exhibits conventional and inverse magnetocaloric effects.