Nitrogen-annealing effects on the electrical resistivity and thermopower of layered ceramics

Chia-Jyi Liu, C. Sheu, M. Huang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report measurements of thermopower and resistivity as a function of temperature on bilayered (Formula presented) ceramics treated in different atmosphere in (Formula presented) and (Formula presented) Chemical titration is used to determine both valence of manganese and content of oxygen. As the sample is annealed in nitrogen, the resistivity of (Formula presented) reduces; the peak resistivity shifts to a higher temperature; the magnetoresistance ratio is enhanced; and the thermopower shifts to a more negative value over the investigated temperature range as compared to the sample annealed in oxygen. These results show that annealing samples in flowing nitrogen has the same effect as the pressure-induced shift of transport behavior. In addition, thermopower data of our ceramic materials resemble those within the ab plane of a single crystal. Transport data will be discussed in terms of the polaron hopping.

Original languageEnglish
Pages (from-to)14323-14326
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number21
DOIs
Publication statusPublished - 2000 Jan 1

Fingerprint

Thermoelectric power
Nitrogen
Annealing
ceramics
nitrogen
electrical resistivity
annealing
Oxygen
Gene Conversion
shift
Magnetoresistance
Manganese
Ceramic materials
Titration
Temperature
oxygen
Single crystals
titration
manganese
valence

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Nitrogen-annealing effects on the electrical resistivity and thermopower of layered ceramics. / Liu, Chia-Jyi; Sheu, C.; Huang, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 61, No. 21, 01.01.2000, p. 14323-14326.

Research output: Contribution to journalArticle

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