A-site-driven ferroelectricity in strained ferromagnetic La2NiMnO6 thin films

R. Takahashi, I. Ohkubo, K. Yamauchi, M. Kitamura, Y. Sakurai, M. Oshima, T. Oguchi, Y. Cho, and M. Lippmaa
Phys. Rev. B 91, 134107 – Published 20 April 2015

Abstract

We report on theoretical and experimental investigation of A-site-driven ferroelectricity in ferromagnetic La2NiMnO6 thin films grown on SrTiO3 substrates. Structural analysis and density-functional theory calculations show that epitaxial strain stretches the rhombohedral La2NiMnO6 crystal lattice along the [111]cubic direction, triggering a displacement of the A-site La ions in the double-perovskite lattice. The lattice distortion and the A-site displacements stabilize a ferroelectric polar state in ferromagnetic La2NiMnO6 crystals. The ferroelectric state only appears in the rhombohedral La2NiMnO6 phase, where MnO6 and NiO6 octahedral tilting is inhibited by the threefold crystal symmetry. Electron localization mapping showed that covalent bonding with oxygen and 6s orbital lone-pair formation are negligible in this material.

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  • Received 17 December 2014
  • Revised 29 January 2015

DOI:https://doi.org/10.1103/PhysRevB.91.134107

©2015 American Physical Society

Authors & Affiliations

R. Takahashi1,*, I. Ohkubo2,3, K. Yamauchi4, M. Kitamura2, Y. Sakurai2, M. Oshima2,5, T. Oguchi4,6, Y. Cho7, and M. Lippmaa1

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
  • 2Department of Applied Chemistry, School of Engineering, University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan
  • 3National Institute for Materials Science, Tsukuba 305-0044, Japan
  • 4Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 5Synchrotron Radiation Research Organization, University of Tokyo, Tokyo 113-8656, Japan
  • 6JST-CREST, Kawaguchi, Saitama, 332-0012, Japan
  • 7Research Institute of Electrical Communication, Tohoku University, Sendai, 980-8577, Japan

  • *rtaka@issp.u-tokyo.ac.jp

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Issue

Vol. 91, Iss. 13 — 1 April 2015

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