Metallic conductivity in infinite-layer strontium iron oxide thin films reduced by calcium hydride

T. Katayama, A. Chikamatsu, Y. Hirose, H. Kumigashira, T. Fukumura, T. Hasegawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Single-crystalline epitaxial SrFeO2 thin films were grown on perovskite substrates with various lattice parameters by combining pulsed laser deposition method with solid-phase reduction using CaH2, and these structural and transport properties were investigated. The highly crystalline films prepared on lattice-matched KTaO3 (0 0 1) substrate exhibited metallic conduction, while those prepared on SrTiO3 (0 0 1) and DyScO3 (1 1 0) substrates were insulating films, in analogy to bulk SrFeO2. From Hall measurements on the metallic SrFeO2 films, the conduction carriers were determined to be n-type (i.e., electrons) with a carrier density of 3.1 × 1018 cm-3 and a mobility of 10.2 cm2 V-1 s-1 at 300 K. It is suggested that the electron carriers are supplied by oxygen vacancies or hydrogen ions in the metallic SrFeO2 films.

Original languageEnglish
Article number135304
JournalJournal of Physics D: Applied Physics
Volume47
Issue number13
DOIs
Publication statusPublished - 2014 Apr 2
Externally publishedYes

Keywords

  • Transition
  • electronic transport phenomena in thin films
  • metal compounds
  • metal-insulator transitions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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