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Soft antiphase tilt of oxygen octahedra in the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7

Feng Ye, Jinchen Wang, Jieming Sheng, C. Hoffmann, T. Gu, H. J. Xiang, Wei Tian, J. J. Molaison, A. M. dos Santos, M. Matsuda, B. C. Chakoumakos, J. A. Fernandez-Baca, X. Tong, Bin Gao, Jae Wook Kim, and S.-W. Cheong
Phys. Rev. B 97, 041112(R) – Published 19 January 2018
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Abstract

We report a single crystal neutron and x-ray diffraction study of the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7 (CMTO), a prototypical system where the electric polarization arises from the condensation of two lattice distortion modes. With increasing temperature (T), the out-of-plane, antiphase tilt of MnO6 decreases in amplitude while the in-plane, in-phase rotation remains robust and experiences abrupt changes across the first-order structural transition. Application of hydrostatic pressure (P) to CMTO at room temperature shows a similar effect. The consistent behavior under both T and P reveals the softness of antiphase tilt and highlights the role of the partially occupied d orbital of the transition-metal ions in determining the stability of the octahedral distortion. Polarized neutron analysis indicates the symmetry-allowed canted ferromagnetic moment is less than the 0.04μB/Mn site, despite a substantial out-of-plane tilt of the MnO6 octahedra.

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  • Received 24 July 2017

DOI:https://doi.org/10.1103/PhysRevB.97.041112

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Feng Ye1,*, Jinchen Wang2,1, Jieming Sheng2,1, C. Hoffmann3, T. Gu4,5, H. J. Xiang4,5, Wei Tian1, J. J. Molaison6, A. M. dos Santos1, M. Matsuda1, B. C. Chakoumakos1, J. A. Fernandez-Baca1, X. Tong6, Bin Gao7, Jae Wook Kim7, and S.-W. Cheong7

  • 1Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Department of Physics, Renmin University of China, Beijing 100872, China
  • 3Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Key Laboratory of Computational Physical Sciences, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
  • 5Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
  • 6Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 7Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • *yef1@ornl.gov

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Issue

Vol. 97, Iss. 4 — 15 January 2018

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