Oxygen non-stoichiometry and high temperature DC conductivity of SmBa2Cu3O6+x

G. Chiodelli, I. Wenneker, P. Ghigna, G. Spinolo, G. Flor, M. Ferretti, E. Magnone

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15 Scopus citations

Abstract

The paper reports on coupled DC electrical conductivity measurements and oxygen non-stoichiometry determinations on SmBa2Cu3O6+x at high temperatures (300-750°C) under oxygen partial pressures from 10-1 to 10-5 atm. Under the lowest oxygen pressures (10-4 and 10-5 atm) and at the highest investigated temperatures (T > 700°C, for the former pressure) the material shows semiconducting behavior. In the other [T, P(O2)] field the material shows metallic conductivity. The amount of (positive) carriers is controlled by equilibrium with external oxygen coupled to oxygen point defects. A change in the mechanism of hole injection is well apparent at the transition between the tetragonal and the orthorhombic phases. Indications are given about the large polaron nature of the holes at high oxygen content.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume308
Issue number3-4
DOIs
StatePublished - 20 Nov 1998

Keywords

  • 123 superconductors
  • Large polarons
  • SmBaCuO

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