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

Abstract

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.

Authors:
;  [1]; ;  [2];  [2];  [3];  [4];  [5];  [6]
  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. (Japan)
  4. Department of Applied Physics, University of Tokyo, Tokyo 113-8586 (Japan)
  5. Devices Technology Research Laboratories, SHARP Corporation, Nara 632-8567 (Japan)
  6. Research Center for Advanced Science and Technology, University of Tokyo, Tokyo 153-8904 (Japan)
Publication Date:
OSTI Identifier:
20775024
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevLett.96.017202; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Wakabayashi, Y., Sawa, H., Bizen, D., Nakao, H., Murakami, Y., Synchrotron Radiation Research Center, JAERI, Sayo 679-5148, Nakamura, M., Ogimoto, Y., and Miyano, K.. Novel Orbital Ordering Induced by Anisotropic Stress in a Manganite Thin Film. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.017202.
Wakabayashi, Y., Sawa, H., Bizen, D., Nakao, H., Murakami, Y., Synchrotron Radiation Research Center, JAERI, Sayo 679-5148, Nakamura, M., Ogimoto, Y., & Miyano, K.. Novel Orbital Ordering Induced by Anisotropic Stress in a Manganite Thin Film. United States. doi:10.1103/PhysRevLett.96.017202.
Wakabayashi, Y., Sawa, H., Bizen, D., Nakao, H., Murakami, Y., Synchrotron Radiation Research Center, JAERI, Sayo 679-5148, Nakamura, M., Ogimoto, Y., and Miyano, K.. Fri . "Novel Orbital Ordering Induced by Anisotropic Stress in a Manganite Thin Film". United States. doi:10.1103/PhysRevLett.96.017202.
@article{osti_20775024,
title = {Novel Orbital Ordering Induced by Anisotropic Stress in a Manganite Thin Film},
author = {Wakabayashi, Y. and Sawa, H. and Bizen, D. and Nakao, H. and Murakami, Y. and Synchrotron Radiation Research Center, JAERI, Sayo 679-5148 and Nakamura, M. and Ogimoto, Y. and Miyano, K.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.96.017202},
journal = {Physical Review Letters},
number = 1,
volume = 96,
place = {United States},
year = {Fri Jan 13 00:00:00 EST 2006},
month = {Fri Jan 13 00:00:00 EST 2006}
}
  • Structural study of orbital-ordered manganite thin films has been conducted using synchrotron radiation, and a ground state electronic phase diagram is made. The lattice parameters of four manganite thin films, Nd0.5Sr0.5MnO3 (NSMO) or Pr0.5Sr0.5MnO3 (PSMO) on (011) surfaces of SrTiO3 (STO) or [(LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7] (LSAT), were measured as a function of temperature. The result shows, as expected based on previous knowledge of bulk materials, that the films' resistivity is closely related to their structures. Observed superlattice reflections indicate that NSMO thin films have an antiferro-orbital-ordered phase as their low-temperature phase while PSMO film on LSAT has a ferro-orbital-ordered phase, and thatmore » on STO has no orbital-ordered phase. A metallic ground state was observed only in films having a narrow region of A-site ion radius, while larger ions favor ferro-orbital-ordered structure and smaller ions stabilize antiferro-orbital-ordered structure. The key to the orbital-ordering transition in (011) film is found to be the in-plane displacement along [011] direction.« less
  • We have performed a detailed study of the long-range and local structure of Nd{sub 0.5}Sr{sub 0.5}MnO{sub 3} films of varying thicknesses. The detailed nature of the in-plane and out-of-plane d spacings as a function of film thickness was determined. Comparisons between the local structure about Mn and the long-range structure were made. We found that Mn coordination asymmetry exists in thin films and that it is related to orbital ordering. The results yield a confirmation of models of manganite systems, which suggests that biaxial strain enhances electron localization.
  • No abstract prepared.
  • The low-temperature orbital ordering structure of Nd0.5Sr0.5MnO3 thin film on SrTiO3 (011) substrate (NSMO/STO011) has been clarified by resonant x-ray scattering. This thin film is the first example of the manganite thin film that has sharp metal-insulator transition, and synchrotron x-ray diffraction reveals the structure of the low-temperature orbital ordered phase. The orbital order structure was found to be the same as the structure of bulk Nd0.5Sr0.5MnO3, while the tilt/rotation of the MnO6 octahedra were different.