Magnetization-steps in Y$_{2}$CoMnO$_{6}$ double perovskite: The role of antisite disorder

Pradheesh, R.; Xiao, Yinguo; Brückel, Th.; Chatterji, Tapan; Cherian, Dona; Hansen, Thomas; Elizabeth, Suja; Nair, Harikrishnan

doi:10.1063/1.4896399

Journal Article

FZJ-2014-05278

Magnetization-steps in Y$_{2}$CoMnO$_{6}$ double perovskite: The role of antisite disorder

Pradheesh, R. ; Xiao, Y.FZJ* ; Cherian, D. ; Elizabeth, S. ; Hansen, T. ; Chatterji, T. ; Brückel, T.FZJ* ; Nair, H. (Corresponding Author)FZJ*

2014
American Inst. of Physics Melville, NY

Journal of applied physics 116(12), 123907 (2014) [10.1063/1.4896399]

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Please use a persistent id in citations: http://hdl.handle.net/2128/16807 doi:10.1063/1.4896399

Abstract: Antisite disorder is observed to have significant impact on the magnetic properties of the double perovskite Y2CoMnO6 which has been recently identified as a multiferroic. A paramagnetic-ferromagnetic phase transition occurs in this material at Tc ≈ 75 K. At 2 K, it displays a strong ferromagnetic hysteresis with a significant coercive field of Hc ≈ 15 kOe. Sharp steps are observed in the hysteresis curves recorded below 8 K. In the temperature range 2 K ≤ T ≤ 5 K, the hysteresis loops are anomalous as the virgin curve lies outside the main loop. The field-cooling conditions as well as the rate of field-sweep are found to influence the steps. Quantitative analysis of the neutron diffraction data shows that at room temperature, Y2CoMnO6 consists of 62% of monoclinic P21/n with nearly 70% antisite disorder and 38% Pnma. The bond valence sums indicate the presence of other valence states for Co and Mn which arise from disorder. We explain the origin of steps by using a model for pinning of magnetization at the antiphase boundaries created by antisite disorder. The steps in magnetization closely resemble the martensitic transformations found in intermetallics and display first-order characteristics as revealed in the Arrott's plots.

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