Influence of oxygen vacancies on transport properties of la 2/3Ca1/3MnO3-y, films grown on SrTiO 3 substrates

Shiu-Jen Liu, Shyh Fen Chen, Jenh Yih Juang, Jiunn Yun Lin, Kaung Hsiung Wu, Tseng Ming Uen, Yi Shun Gou

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We prepared La2/3Ca1/3MnO3-y films with various oxygen contents on SrTiO3 substrates and measured the temperaturedependent resistivity of the manganite films under tensile stress due to the lattice mismatch between manganites and singlecrystal substrates. The effect of oxygen vacancies on the transport properties of the films was investigated. The experimental results reveal that the dependence of temperature on the resistivity of fully oxygenated films can be attributed to the adiabatic small-polaron conduction and unconventional one-magnon scattering at temperatures above and far below the insulator-metal (I-M) transition temperature, respectively. However, for highly oxygen-deficient films, the temperature-dependent resistivity can be ascribed to Mott's variable-range- hopping and small polaron metallic conduction at temperatures above and far below the I-M transition temperature, respectively.

Original languageEnglish
Pages (from-to)6621-6625
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number10 A
DOIs
Publication statusPublished - 2007 Oct 9

Keywords

  • Colossal magnetoresistance
  • Insulator-metal transition
  • Manganites
  • Pulsed-laser deposition
  • Small polaron
  • Variable range hopping

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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