Double-exchange model study of multiferroic RMnO3 perovskites
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- RIKEN, Saitama (Japan)
- Nanjing Univ. (China). Nanjing National Lab. of Microstructures (NNLM)
In this proceeding, recent theoretical investigations by the authors on the multiferroic RMnO3 perovskites are briefly reviewed at first. Using the double-exchange model, the realistic spiral spin order in undoped manganites such as TbMnO3 and DyMnO3 is well reproduced by incorporating a weak next-nearest neighbor superexchange (~10% of nearest neighbor superexchange) and moderate Jahn-Teller distortion. The phase transitions from the A-type antiferromagnet (as in LaMnO3), to the spiral phase(as in TbMnO3), and finally to the E-type antiferromagnet (as in HoMnO3), with decreasing size of the R ions, were also explained. Moreover, new results of phase diagram of the three-dimensional lattice are also included. The ferromagnetic tendency recently discovered in the LaMnO3 and TbMnO3 thin films is explained by considering the substrate stress. Finally, the relationship between our double-exchange model and a previously used J1-J2-J3 model is further discussed from the perspective of spin wave excitations.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 971241
- Journal Information:
- European Physical Journal. B, Condensed Matter and Complex Systems, Vol. 71, Issue 3; ISSN 1434-6028
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
|
journal | November 2015 |
Recent Progress of Multiferroic Perovskite Manganites | text | January 2012 |
Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology | text | January 2015 |
Similar Records
Ultrafast optical pump-probe spectroscopy is used to reveal the coexistence of coupled antiferromagnetic (AFM)/ferroelectric (FE) and ferromagnetic (FM) orders in multiferroic TbMnO3 films, which can guide researchers in creating new kinds of multiferroic materials.
The prominent role of oxygen in the multiferroicity of DyMnO3 and TbMnO3: a resonant soft x-ray scattering spectroscopy study