Multiple magnetic phase transitions and magnetocaloric effect in double perovskites R2NiMnO6 (R = Dy, Ho, and Er)

Temperature-dependent structural and magnetic properties of R2MMnO6 double perovskites (R = Dy, Gd; M = Ni, Co)

“…The different behavior observed for the three compounds indicates that they have different coupling strength and sign between the rare earth moments and the ordered 3d moments. From the high field data (µ 0 H = 1T) the magnetic entropy change [11,17,31,32,35]. As seen from the insets of Fig.…”

“…In recent years, rare earth double perovskites R 2 MMnO 6 (M being Ni or Co) have attracted widespread attention due to their rich physical properties, showing a complicated interplay between electric and magnetic properties [1][2][3][4][5][6][7][8][9][10][28][29][30][31]. However, in contrast to the extensively investigated La 2 CoMnO 6 compound, less consideration has been given to other perovskite manganites such as R 2 MMnO 6 (R = Dy and Gd) [32][33][34][35][36][37][38]. In the R 2 CoMnO 6 family, a change in the size of the rare-earth ion can induce significant alterations in the Co-O-Mn bond angle and bond length, which significantly modifies the superexchange interaction and consequently affects their electronic and magnetic ground states [3,4,8].…”

“…as A-cation due to their large magnetic moment [28,[31][32][33][34][35]. A few studies have attempted to correlate the changes in structure with the variations in the nature of magnetic ordering in these compounds [1,2,4,8].…”

Resonance Effect of Ionic Valences on the Structural and Magnetic Properties of Dy2NiMnO6 Induced by Nonmagnetic Al Ion Doping

“…Double perovskite oxides (A 2 NiMnO 6 , A = rare earth) have drawn great attention owning to the unique physical property and potential applications, including sensors, spintronics, large magnetocapacitance and magnetoresistance devices. Among them, La 2 NiMnO 6 is an attractive material with large magneto‐capacitance, magnetoresistance effect and super high ferromagnetic (FM) transition temperature T C1 ≈ 280 K .…”

“…Apart from the La 2 NiMnO 6 , researchers also focus on the investigation of other A 2 NiMnO 6 oxides simultaneously . For example, Jia et al reported the multiple magnetic phase transitions and magnetocaloric effect in A 2 NiMnO 6 ( A = Dy, Ho, and Er), including three magnetic phase transitions ( T R , T d–f , T C ) were observed for R 2 NiMnO 6 compounds corresponding to the rare earth ordering, 3d–4f exchange, and 3d metal ordering, respectively . Filho et al investigated the influence of rare‐earth ionic radii on spin‐phonon coupling in A 2 NiMnO 6 ( A = Nd and Gd) and found that the magnitude of the spin ‐ phonon coupling is independent on the rare‐earth ionic radius .…”