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

Journal Article · Fri Jan 13 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.017202· OSTI ID:20775024

Wakabayashi, Y; Sawa, H ^[1]; Bizen, D; Nakao, H ^[2]; Murakami, Y ^[2]; Nakamura, M ^[3]; Ogimoto, Y ^[4]; Miyano, K ^[5]

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1. Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801 (Japan)
2. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
3. Department of Applied Physics, University of Tokyo, Tokyo 113-8586 (Japan)
4. Devices Technology Research Laboratories, SHARP Corporation, Nara 632-8567 (Japan)
5. Research Center for Advanced Science and Technology, University of Tokyo, Tokyo 153-8904 (Japan)

A novel structure of orbital ordering is found in a Nd{sub 0.5}Sr{sub 0.5}MnO{sub 3} 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{sub MI}), and superlattice reflections appear below 140 K (=T{sub CO}). The electronic structure between T{sub MI} and T{sub CO} is identified as A-type antiferromagnetic with a d{sub x{sup 2}-y{sup 2}} 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{sub 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.

• OSTI ID: 20775024
• Journal Information: Physical Review Letters, Vol. 96, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.96.017202; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
ELECTRONIC STRUCTURE
LATTICE PARAMETERS
MANGANESE OXIDES
NEODYMIUM COMPOUNDS
PHASE TRANSFORMATIONS
STRESSES
STRONTIUM COMPOUNDS
SUBSTRATES
SUPERLATTICES
TEMPERATURE RANGE 0065-0273 K
THIN FILMS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION