Spatial coherence of the insulating phase in quasi-two-dimensional LaNiO3 films

Masato Anada, Kazuhiro Kowa, Hiroki Maeda, Enju Sakai, Miho Kitamura, Hiroshi Kumigashira, Osami Sakata, Yoshinori Nakanishi-Ohno, Masato Okada, Tsuyoshi Kimura, and Yusuke Wakabayashi
Phys. Rev. B 98, 014105 – Published 10 July 2018

Abstract

The quasi-two-dimensional nature of LaNiO3 (LNO) thin films on SrTiO3(001) (STO) and LaAlO3(001) (LAO) substrates is examined. Although both samples undergo a metal-insulator transition with decreasing thickness, the spatial distributions of the insulating phase within the films differ from each other. The LNO cell volume of the insulating phase in LNO/STO is larger than that of the metallic phase, and the large cells remain at the interface in thick films with metallic conduction, suggesting a high oxygen-vacancy content at the interface. The cell volume of the insulating phase in LNO/LAO is smaller than that of the metallic phase, and the cell volume of the entire film changes coherently. The cell-volume decrease indicates that the bonding changes from bulklike to covalent.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 29 March 2018
  • Revised 19 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.014105

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Masato Anada1, Kazuhiro Kowa1, Hiroki Maeda1, Enju Sakai2,*, Miho Kitamura2, Hiroshi Kumigashira2,3, Osami Sakata4, Yoshinori Nakanishi-Ohno5,6, Masato Okada7, Tsuyoshi Kimura1,7, and Yusuke Wakabayashi1,†

  • 1Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
  • 2Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
  • 3Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • 4Synchrotron X-ray Station at SPring-8, National Institute for Materials Science (NIMS), Sayo 679-5148, Japan
  • 5Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
  • 6Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
  • 7Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan

  • *Present address: Environmental Science Center, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.
  • wakabayashi@mp.es.osaka-u.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 98, Iss. 1 — 1 July 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×