Defect-induced modulation of magnetic, electronic, and optical properties of the double-perovskite oxide La2CoMnO6

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

“…The effective paramagnetic moment for a perfectly ordered, well known system (LCMO) is 6 µ B [5], reported earlier. In comparison with ordered LCMO the effective moment of YCMO is littlebit lower.…”

“…Murthy et al show that the coupling between FM and AFM phases increase with Sr doping at La site in LCMO [35]. Again, first-principle calculations show that the ASD increases with Sr doping at La site in LCMO [5]. The present work deals with the occurrence of ASD with Gd doping at Y site and its effects on the magnetic properties of the system.…”

“…Multifunctional insulators with strong magnetoelectric coupling, room-temperature ferromagnetism and colossal magnetoresistance have sparked substantial research interests during the last two decades [1]. In this regard, double perovskite materials with the general formula R 2 BB O 6 (R= Y, rare earth, B/B transition metal) show many promises: they exhibit intriguing properties like magnetodielectric, magnetocapacitance, exchange bias anisotropy, magnetocaloric effect [2,3,4], and others, which account for their wide range of applications in spintronics, sensors, tunable microwave filters, energy harvesting devices and transformers [5]. The strong interplay between spin, charge, and lattice degree of freedom is responsible for such interesting multifunctional characteristics [6,7].…”

Mechanisms for point defect-induced functionality in complex perovskite oxides

“…La 2 CoMnO 6 with a checkerboard B-site order is ferromagnetic due to the dominant exchange interaction between Co 2+ and Mn 4+ ions. Reduction via oxygen vacancy formation preferentially occurs on the Mn sites, while oxidation via Sr doping on the A-site affects the Co sites [63]. In both cases, the Curie temperature is lowered as the vacancy and Sr defects induce strong antiferromagnetic exchange or reduce the strength of ferromagnetic exchange, respectively.…”

Maxwell–Wagner Polarization and Mixed Ferromagnetic and Antiferromagnetic State in Eu2CoMnO6

“…The ongoing research on multifunctional materials drives people toward double perovskite (DP) oxides, i.e., A 2 BB'O 6 (A = rareearth/alkaline cation and B/B' = transition-metal cations). [1][2][3][4][5][6] The recent studies on various rare-earth-based DP with B sites occupied by Co and Mn, that is R 2 CoMnO 6 (R = La to Lu), have received extensive attention owing to their various exciting functional properties, namely, electrical and optical properties, [7,8] defect-induced modulation of physical properties, [9] tunable magnetization steps, [10] magnetocaloric effect and pyro-current, [11,12] magnetoresistance, [13] exchange bias, [14][15][16] magnetocaloric and magnetodielectric effects, [17,18] Griffiths-like and non-Griffithslike clustered phase, [19][20][21] spin-phonon coupling (SPC), [22] Hopkinson effect, [23] multiferroicity, [24] etc. The slight change in rare-earth size in the R 2 CoMnO 6 family instigates significant variations in the Co─O─Mn bond length and angle, thus modifying magnetic and electronic ground states via modification of superexchange (SE) interactions.…”