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.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films