B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

Abstract

The disorder in any system affects their physical behaviour. In this scenario, we report the possibility of disorder in A2BB'O6 oxides and their effect on different magnetic properties. These systems show anti-site disorder by interchanging B and B' elements from their ordered position and giving rise to anti-phase boundary. The presence of disorder leads to a reduction in saturation magnetization and magnetic transition temperature. The disorder prevents the system from sharp magnetic transition which originates short-range clustered phase (or Griffiths phase) in the paramagnetic region just above the long-range magnetic transition temperature. Further, we report that the presence of anti-site disorder and anti-phase boundary, A2BB'O6 oxides give different interesting magnetic phases like metamagnetic transition, spin-glass, exchange bias, magnetocaloric effect, magnetodielectric, magnetoresistance, spin-phonon coupling, etc.

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

“…This equation is described in detail in our earlier report. [ 1,63 ] The exponent λ lie within 0–1 for < T < T GP . For ECMO, the value of λ is found to be around 0.47 fit in the GP region (as shown in the inset of Figure 8a), which again confirms the presence of the Griffiths phase.…”

“…[ 28–31 ] Owing to their good functional performance and potential applications in a variety of industries that have drawn extensive attention due to their versatility. [ 1 ]…”

“…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.…”

“…[28][29][30][31] Owing to their good functional performance and potential applications in a variety of industries that have drawn extensive attention due to their versatility. [1] However, R 2 CoMnO 6 DPs with "R" site nonmagnetic ions (i.e., Eu, Lu, Y, La) have drawn widespread attention as their spin dynamics depend only on the valence state of the transition-metal cations B/B 0 utilizing their exchanges interaction with each other. In the case "R" is a nonmagnetic ion, the interaction of R with B/B 0 can be neglected.…”

Enhancement of Multiferroic and Optical Properties in BiFeO3 Due to Different Exchange Interactions Between Transition and Rare Earth Ions

“…Moreover, the magnetic property of perovskite oxides is highly sensitive to doping on its site as a different dopant will change/deform its lattice structure. [ 39 ] Thus, it is expected that the co‐doping will improve the magnetic property in the present system. In this article, we focus primarily on optical, dielectric, and magnetic properties.…”