Corundum insulating phases in highly Ti-doped V2O3 nanocrystals

Yoichi Ishiwata, Toru Maruyama, Sho Otsuru, Takuto Tsukahara, Hirofumi Ishii, Yen-Fa Liao, Ku-Ding Tsuei, Masaki Imamura, Kazutoshi Takahashi, Yuji Inagaki, Tatsuya Kawae, Tetsuya Kida, Satoshi Suehiro, Masashi Nantoh, and Koji Ishibashi
Phys. Rev. B 101, 035415 – Published 16 January 2020

Abstract

Doping V2O3 with Ti stabilizes the corundum paramagnetic metallic phase and restricts the transition to the monoclinic antiferromagnetic insulating phase at lower temperatures. In this study, we investigated the dependence of phase stability on Ti concentration for V2O3 nanocrystals as small as 20 nm. Ti doping of several percent induces a high-temperature insulating phase preserving the magnetic transition without the crystal symmetry change. The emergence of the insulating phases, which are peculiar to this crystal size, can be attributed to the enhancement of the on-site Coulomb interaction U and increased mixing between a1g and egπ states accompanied by characteristic lattice parameter changes in the high Ti doping region.

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  • Received 31 October 2018
  • Revised 11 December 2019

DOI:https://doi.org/10.1103/PhysRevB.101.035415

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yoichi Ishiwata1,*, Toru Maruyama1, Sho Otsuru1, Takuto Tsukahara1, Hirofumi Ishii2, Yen-Fa Liao2, Ku-Ding Tsuei2, Masaki Imamura3, Kazutoshi Takahashi3, Yuji Inagaki4, Tatsuya Kawae4, Tetsuya Kida5, Satoshi Suehiro6, Masashi Nantoh7, and Koji Ishibashi7,8

  • 1Department of Physics, Saga University, Saga 840-8502, Japan
  • 2National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 3Synchrotron Light Application Center, Saga University, Saga 840-8502, Japan
  • 4Department of Applied Quantum Physics, Kyushu University, Fukuoka 819-0395, Japan
  • 5Department of Applied Chemistry and Biochemistry, Kumamoto University, Kumamoto 860-8555, Japan
  • 6Materials Research and Development Laboratory, Japan Fine Ceramic Center (JFCC), Nagoya 456-8587, Japan
  • 7Advanced Device Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako 351-0198, Japan
  • 8CEMS, RIKEN, Wako 351-0198, Japan

  • *ishiwata@cc.saga-u.ac.jp

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Vol. 101, Iss. 3 — 15 January 2020

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