Nonlinear I-V Characteristics of the Granular PrBa2Cu3O7-δ Compound

Juhn-Jong Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We have measured the current-voltage {TV) curves in the granular PrBa2Cu3O7_δ compound. We find that they are nonlinear when the bias is high enough. The experimental curves can be well described by I=Σ0 V+Σ1 Vb, where Σ0 is the linear conductance, Σ1 is the high-order conductance, and the degree of the nonlinear term is found to be either b = 2 or 3. We observe that the critical current, IC, at which the nonlinear contribution becomes comparable with the linear contribution, scales with Σ0 as Ic≍ Σ0x, with x=0.56 -0.02 for the two cases b = 2 and 3. We also observe that Σ1 scales with Σ0 as Σ1≍Σ;0y, with y=1.43 -0.05 (for b=2) or 1.92-0.06 (for b=3). These experimental values of x and y are in line with the theoretical prediction based on a nonlinear-random-resistor-network model.

Original languageEnglish
Pages (from-to)4125-4132
Number of pages8
JournalJournal of the Physical Society of Japan
Volume61
Issue number11
DOIs
StatePublished - 1 Jan 1992

Keywords

  • critical current
  • granular structure
  • high-order conductance
  • nonlinear I-V characteristics
  • percolation
  • PrBa2Cu3O7-δ compound
  • random resistor networks
  • scaling

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