2005/06/21 by Yusuke Wakabayashi, Y. Wakabayashi, Daisuke Bizen +14 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.96.017202
published as Phys. Rev. Lett. 96 017202 (2006) · 4pages, 4figures
arxiv created 2005/06/21 · openalex publication_date 2006/01/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (=TMI), and superlattice reflections appear below 140 K (=TCO). The electronic structure between TMI and TCO is identified as A-type antiferromagnetic with a d_x2\ensuremath-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 TCO. 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.