Orbital ordering structures in (Nd,Pr)0:5Sr 0:5MnO3 manganite thin films on perovskite (011) substrates

Yusuke Wakabayashi, Daisuke Bizen, Yugo Kubo, Hironori Nakao, Youichi Murakami, Masao Nakamura, Yasushi Ogimoto, Kenjiro Miyano, Hiroshi Sawa

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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, Nd 0:5Sr0:5MnO3 (NSMO) or Pr0:5Sr 0:5MnO3 (PSMO) on (011) surfaces of SrTiO3 (STO) or [(LaAlO3)0:3(SrAl0:5Ta 0:5O3)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 that 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.

Original languageEnglish
Article number014712
Journaljournal of the physical society of japan
Volume77
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1
Externally publishedYes

Keywords

  • Orbital ordering
  • Thin film
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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