Oxygen-dependent transport properties in La0.7Ba0.3MnO3-δ thin films for uncooled infrared bolometric materials

Ken Ichi Hayashi, Eiji Ohta, Hideo Wada

Research output: Contribution to journalConference article

Abstract

La0.7Ba0.3MnO3-δ (LBMO) has been noticed as a potential candidate for an uncooled infrared bolometer material, which has a large temperature dependent electrical resistance, as a potential candidate for an uncooled infrared bolometer material. The LBMO thin films were deposited on SrTiO3 (100) substrates by a laser ablation method. The films were characterized by an x-ray diffractometer. In the observation by an atomic force microscope, the size of the crystal grains and the number of grain boundaries on the films were extremely sensitive on the ambient oxygen pressure during the deposition. The grain size found to have an effect on both the magnitude of the resistivity and the temperature dependence of resistivity. The films deposited under the oxygen pressures of 53.3∼80.0Pa, having the temperature dependence of resistivity like a bulk, and it showed a large temperature coefficient of resistance (TCR: defined as 1/R dR/dT) over 3%/K near room temperature.

Original languageEnglish
Pages (from-to)160-167
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4454
DOIs
Publication statusPublished - 2001 Dec 1
EventMaterials for Infrared Detectors - San Diego, CA, United States
Duration: 2001 Jul 302001 Aug 1

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Keywords

  • Atomic force microscope
  • Laser ablation
  • Temperature coefficient of resistance
  • Uncooled infrared bolometer
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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