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, Yusuke Wakabayashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Article number014105
JournalPhysical Review B
Volume98
Issue number1
DOIs
Publication statusPublished - 2018 Jul 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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