Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994021 | Journal of Alloys and Compounds | 2018 | 18 Pages |
Abstract
From the high resolution powder neutron diffraction data, we obtain an evidence of spin-reorientation type transition around â¼150â¯K in nanoscale BiFeO3. The magnetic phase forms at â¼150â¯K, as a result of canting of the spins away from c-to a-axis by â¼6°, has been modeled by considering two antiferromagnetic phases of propagation vectors k = (0, 0, 0) and (0, 1/4, 1/4) and moments aligned along c- and a-axes. Direct magnetic measurement too, under both 0 and 50â¯kOe field, offers evidence for such a transition. While the experiment on a single crystal does not offer any evidence of magnetic transition at â¼150â¯K [M. Ramazanoglu et al. Phys. Rev. B 83 (2011), art. 174434(1-6)], clear observation of the transition in nanoscale BiFeO3 implies crucial role of the antiferrodistortive rotation of FeO6 octahedra, associated with large magnetization and enhanced canting angle, in inducing the transition. The transition is found to have a significant influence on the crystallographic parameters too, including the structural noncentrosymmetry which show distinct anomaly around 150â¯K.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Sudipta Goswami, Dipten Bhattacharya,