Phys Rev Lett. 2006 Jan 13;96(1):017202. Epub 2006 Jan 4.

Novel orbital ordering induced by anisotropic stress in a manganite thin film.

Wakabayashi Y, Bizen D, Nakao H, Murakami Y, Nakamura M, Ogimoto Y, Miyano K, Sawa H.

Source

Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan.

Abstract

A novel structure of orbital ordering is found in a Nd0.5Sr0.5MnO3 thin film, which exhibits a clear first-order transition, by synchrotron x-ray diffraction measurements. Lattice parameters vary drastically at the metal-insulator transition at 170 K (= T(MI)), and superlattice reflections appear below 140 K (= T(CO)). The electronic structure between T(MI) and T(CO) is identified as A-type antiferromagnetic with a d(x2-y2) ferro-orbital ordering. The new type of antiferro-orbital ordering characterized by the wave vector (1/4 1/4 1/2) in cubic notation emerges below T(CO). 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.

PMID:: 16486508; [PubMed]

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