Abstract
We report measurements of the resistivity (ρ), thermoelectric power (TEP), and Hall coefficient () of sintered for a range of δ values and for temperatures up to 300 K. As δ is increased, increases slightly, reaching a maximum for δ close to 0.1, and the TEP changes sign from negative to positive, while is positive for all values of δ. At low values of δ there is a marked increase in the fluctuation conductivity, which we have analyzed in terms of Aslamazov-Larkin fluctuations to determine the out-of-plane correlation length (0). A corresponding analysis of specific-heat data enables us to deduce the in-plane correlation length as well. We discuss the strong dependence of the Hall number on temperature and δ.
- Received 25 June 1991
DOI:https://doi.org/10.1103/PhysRevB.44.12086
©1991 American Physical Society