Tensile-Strain-Dependent Spin States in Epitaxial LaCoO3 Thin Films

Y. Yokoyama, Y. Yamasaki, M. Taguchi, Y. Hirata, K. Takubo, J. Miyawaki, Y. Harada, D. Asakura, J. Fujioka, M. Nakamura, H. Daimon, M. Kawasaki, Y. Tokura, and H. Wadati
Phys. Rev. Lett. 120, 206402 – Published 17 May 2018
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Abstract

The spin states of Co3+ ions in perovskite-type LaCoO3, governed by the complex interplay between the electron-lattice interactions and the strong electron correlations, still remain controversial due to the lack of experimental techniques which can directly detect them. In this Letter, we revealed the tensile-strain dependence of spin states, i.e., the ratio of the high- and low-spin states, in epitaxial thin films and a bulk crystal of LaCoO3 via resonant inelastic soft x-ray scattering. A tensile strain as small as 1.0% was found to realize different spin states from that in the bulk.

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  • Received 24 August 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.206402

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Yokoyama1,2,*, Y. Yamasaki3,4,5, M. Taguchi6,†, Y. Hirata1,2, K. Takubo1, J. Miyawaki1, Y. Harada1, D. Asakura7, J. Fujioka3, M. Nakamura4, H. Daimon6, M. Kawasaki3,4, Y. Tokura3,4, and H. Wadati1,2

  • 1Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
  • 2Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
  • 3Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 4RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 5National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
  • 6Nara Institute of Science and Technology (NAIST), 8916-5, Takayama, Ikoma, Nara 630-0192, Japan
  • 7Research Institute for Energy Conservation, National Institute of Advance Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba 305-8568, Japan

  • *Present address: National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan. YOKOYAMA.Yuichi@nims.go.jp
  • Present address: Toshiba Nanoanalysis Corporation Kawasaki, Kanagawa 212-8583, Japan. munetaka.taguchi@nanoanalysis.co.jp

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Issue

Vol. 120, Iss. 20 — 18 May 2018

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