Positive temperature coefficient of resistivity and negative differential resistivity in lead iron tunstate-lead zirconate titate

Ashok Kumar*, Ram S. Katiyar, J. F. Scott

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A tetragonal crystal of formula (PbFe(0.67)W(0.33)O(3))(0.2)(PbZr(0.53)Ti(0.47)O(3))(0.8) ("PFW/PZT") was recently found to exhibit ferroelectric switching via magnetic fields of H=0.5 T at room temperature [Kumar , arXiv:0812.3875v2]. In the present study we found that this material exhibits two other unusual properties: a positive temperature coefficient of resistivity (PTCR) and negative differential resistivity. These phenomena are often considered to be unrelated and PTCR usually results from grain boundary effects, but can be bulk [D. C. Sinclair and A. R. West, J. Appl. Phys. 66, 3850 (1989)]. Within the diffusion theory of Dawber and Scott [J. Phys. Condens. Mater. 16, L515 (2004)] they are necessarily related and we fitted the present data to their diffusion-limited model.

Original languageEnglish
Article number212903
Number of pages3
JournalApplied Physics Letters
Volume94
Issue number21
DOIs
Publication statusPublished - 25 May 2009

Keywords

  • diffusion
  • electrical resistivity
  • ferroelectric switching
  • ferroelectric thin films
  • grain boundaries
  • lead compounds
  • THIN-FILMS
  • LIMITED CURRENT
  • ELECTRODES
  • CAPACITORS
  • EMISSION
  • PZT

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