Novel magnetic arrangement and structural phase transition induced by spin–lattice coupling in multiferroics

Springer Science and Business Media LLC - 2013
Satadeep Bhattacharjee1, Dovran Rahmedov1, Laurent Bellaiche1, Dawei Wang2
1Department of Physics and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, USA
2Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, China

Tóm tắt

Using an effective Hamiltonian of mutiferroic BiFeO3 (BFO) as a toy model, we explore the effect of the coefficient, C, characterizing the strength of the spin–current interaction, on physical properties. We observe that for larger C values and below a critical temperature, the magnetic moments organize themselves in a novel cycloid, which propagates along a low-symmetry direction and is associated with a structural phase transition from polar rhombohedral to a polar triclinic state. We emphasize that both of these magnetic and structural transitions are results of a remarkable self-organization of different solutions of the spin–current model.

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