Electrical resistivity anomaly in quasi-one-dimensional compound KFeS2

Shido Nishioka, Kenichi Nozaki, Hisao Kuriyaki, Kazuyoshi Hirakawa

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Abstract

The origin of an anomalous behavior of DC resistivity in a quasi-one-dimensional compound KFeS2 was studied using transmission-electron-microscopy (TEM) and differential scanning calorimetry (DSC). The resistivity of the as-grown crystal exhibits sharp decrease around room temperature with a thermal hysteresis. However, this sharp decrease in the resistivity disappears after annealing the specimen at 300°C for two days. A endothermic peak in DSC is found in the range of 230K-280K, which corresponds to that of the decrease in the resistivity. TEM images of as-grown specimens show larger numbers of dislocations and higher density of plain defects comparing with annealed specimens. The FeS2 chain is supposed to be interrupted and to form "FeS2 segment". A model based on some kind of defects relaxes to thermal equilibrium state is proposed.

Original languageEnglish
Pages (from-to)69-77
Number of pages9
JournalResearch Reports on Information Science and Electrical Engineering of Kyushu University
Volume1
Issue number1
Publication statusPublished - Sep 1 1996

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Electrical and Electronic Engineering

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