Novel Orbital Ordering induced by Anisotropic Stress in a Manganite Thin Film

Details Novel Orbital Ordering induced by Anisotropic Stress in a Manganite Thin Film Novel Orbital Ordering induced by Anisotropic Stress in a Manganite Thin Film

2005-06-21

arxiv.org/abs/cond-mat/0506544v1

Phys. Rev. Lett. 96 017202 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 4figures

Scientific paper

10.1103/PhysRevLett.96.017202

We performed resonant and nonresonant x-ray diffraction studies of a Nd0.5Sr0.5MnO3 thin film that exhibits a clear first-order transition. Lattice parameters vary drastically at the metal-insulator transition at 170K (=T_MI), and superlattice reflections appear below 140K (=T_CO). The electronic structure between T_MI and T_CO is identified as A-type antiferromagnetic with the d_{x2-y2} ferroorbital ordering. Below T_CO, a new type of antiferroorbital ordering emerges. The accommodation of the large lattice distortion at the first-order phase transition and the appearance of the novel orbital ordering are brought about by the anisotropy in the substrate, a new parameter for the phase control.

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