標題: Influence of oxygen vacancies on transport properties of La2/3Ca1/3MnO3-y films grown on SrTiO3 substrates
作者: Liu, Shiu-Jen
Chen, Shyh-Fen
Juang, Jenh-Yih
Lin, Jiunn-Yun
Wu, Kaung-Hsiung
Uen, Tseng-Ming
Gou, Yi-Shun
物理研究所
Institute of Physics
關鍵字: colossal magnetoresistance;manganites;insulator-metal transition;pulsed-laser deposition;small polaron;variable range hopping
公開日期: 1-Oct-2007
摘要: We prepared La2/3Ca1/3MnO3-y films with various oxygen contents on SrTiO3 substrates and measured the temperature-dependent resistivity of the manganite films under tensile stress due to the lattice mismatch between manganites and single-crystal 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.
URI: http://dx.doi.org/10.1143/JJAP.46.6621
http://hdl.handle.net/11536/10295
ISSN: 0021-4922
DOI: 10.1143/JJAP.46.6621
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume: 46
Issue: 10A
起始頁: 6621
結束頁: 6625
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