Abstract
We report electrical transport experiments on the colossal magnetoresistance compound over a wide range of composition and temperature. Comparison of thermopower and electrical resistivity measurements above the metal-insulator transition indicate a transport mechanism not dominated by spin disorder, but by small polaron formation. Additionally, we find that in the high-temperature limit the thermopower corresponds to backflow of spin entropy, expected from motion of positively charged particles in a rigid system, showing a remarkable independence of particle density.
- Received 18 November 1996
DOI:https://doi.org/10.1103/PhysRevB.56.5104
©1997 American Physical Society