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Stabilization of charge and orbital ordered states by antiferromagnetism in the A-site ordered YBaMn2O6
- Publication Year :
- 2009
-
Abstract
- We report on Raman scattering measurements of the A-site ordered YBaMn2O6 in the wide temperature range of 10-650K. Upon cooling almost all phonon modes show pronounced temperature dependencies of frequency, linewidth, and scattering intensity. This suggests that the octahedra tilting, Mn-O bond angles and lengths vary with temperature in a concerted way. The remarkable feature is that the high-temperature metallic and the charge and orbital ordered (CO-OO) states coexist down to T_N=195K. In the antiferromagnetic state zone-folded modes are induced by the CO-OO superstructure and the phonon modes undergo an anomalous softening and narrowing. Our results evidence that the CO-OO state is stabilized by the spin ordering for temperatures below T_N.<br />Comment: 4 pages, 3 figures, added reference and corrections
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.0909.4494
- Document Type :
- Working Paper