Effect of Jahn-Teller distortion on magnetic ordering in Dy(Fe,Mn)O 3 perovskites
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
83
Journal Issue
24
Date Issued
2011
Author(s)
Abstract
The structural, magnetic properties of the rare-earth perovskites, DyFe1-xMnxO3 (space group, orthorhombic Pbnm), were studied, and the magnetic phase diagram of the solid solution was investigated, which unveiled an unexplored hidden field-induced weak ferromagnetism in the material system with x = 0.5-0.9 (antiferromagnetically ordered along the b axis and canted along the c axis). In the solid solution, the Jahn-Teller distortion contributed by Mn3+ gives rise to the predominance of the bc plane sublattice with increasing Mn and also the effective onset of orbital ordering in the ab plane for x = 0.5 and above. These distinct features in the respective lattice and orbital degrees of freedom induce the Dy-(Fe,Mn) electronic interaction anisotropy primarily in the bc plane and the growing in-(ab)plane electronic anisotropy, effectively competing with each other above x = 0.5. The close entanglement of these anisotropies introduced by the various lattice, orbital, and correlated electronic characters results in the favoring of the Dzyaloshinskii-Moriya interaction dictating along the a axis, in contrast to the conventionally observed b axis and accounting for the hidden field-induced canted magnetic ordering in the bc plane. The complex interplays of these multiple factors are discussed in this work and satisfactorily explain the rich magnetic phase diagram of the solid solution. © 2011 American Physical Society.
Type
journal article