Equilibrium electrical conductivity and Seebeck coefficient measurements over the temperature range 500-800°C in YBa2Cu4O8 (Y-124) exhibit evidence for two distinct conduction mechanisms, one metallic and one activated. It is speculated that the metallic mechanism is associated with the Cu-O planes, whereas the activated mechanism is associated with the Cu-O chains, just as in YBa2Cu3O6+y (Y-123). Like the other superconducting cuprates, Y-124 electrical properties obey a standard relationship of Seebeck coefficient versus logarithm of conductivity. Analysis of behavior in Y-124 may provide useful insight into the electrical and superconducting behavior of the other cuprates, particularly Y-123.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Energy Engineering and Power Technology
- Materials Chemistry
- Condensed Matter Physics