Data for the normal state of the superconducting oxide systems YBa2Cu3O6+y, and the nonsuperconducting system La3Ba3Cu6O12.5+y, when plotted as thermoelectric coefficient versus logarithm of conductivity, exhibit Jonker “pear” behavior, confirming the semiconducting character of these materials. The symmetry of the plots indicates similar conduction parameters (density‐of‐states (DOS), transport constants, and mobilities) for p‐ and n‐type mechanisms. Band gaps on the order of 0.5 eV are obtained. DOS—mobility products for the above‐mentioned systems and La2‐xBaxCuO4 and Bi2Sr2CaCu2O8 scale roughly according to the density of copper ions in these materials and fall in the range 1020 to 1021 (cm·V·s)−1. Assuming DOS equal to copper content results in mobilities on the order of 0.15 cm2·V−1· s−1. These results are discussed in terms of possible semiconduction mechanisms.
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1990|
- electrical properties
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry