Epitaxial-Strain-Induced Multiferroicity in SrMnO3 from First Principles
Abstract
First-principles calculations reveal a large spin-phonon coupling in cubic SrMnO3, with ferromagnetic ordering producing a polar instability. Through combination of this coupling with the strain-polarization coupling characteristic of perovskites, the bulk antiferromagnetic-paraelectric ground state is driven to a previously unreported multiferroic ferroelectric-ferromagnetic state by increasing epitaxial strain. This state has a computed Ps>54μC/cm2 and magnetic Tc>92K. Large mixed magnetic-electric-elastic responses are predicted in the vicinity of the phase boundaries.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2010
- DOI:
- arXiv:
- arXiv:0910.5438
- Bibcode:
- 2010PhRvL.104t7204L
- Keywords:
-
- 75.80.+q;
- 63.20.-e;
- 75.10.Hk;
- 77.80.-e;
- Magnetomechanical and magnetoelectric effects magnetostriction;
- Phonons in crystal lattices;
- Classical spin models;
- Ferroelectricity and antiferroelectricity;
- Condensed Matter - Materials Science;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, 2 figures, 1 table