Stabilization of charge and orbital ordered states by antiferromagnetism in the A-site ordered YBaMn2O6

Details Stabilization of charge and orbital ordered states by antiferromagnetism in the A-site ordered YBaMn2O6 Stabilization of charge and orbital ordered states by antiferromagnetism in the A-site ordered YBaMn2O6

2009-09-24

arxiv.org/abs/0909.4494v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, added reference and corrections

Scientific paper

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.

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