Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10710243 | Journal of Magnetism and Magnetic Materials | 2005 | 10 Pages |
Abstract
With a view to understand the conduction mechanism in these materials, the electrical conductivity of all these materials was measured over a temperature range 80-300Â K and in a magnetic field upto 7Â T and the data were analyzed by using several theoretical models. It has been observed that the metallic (ferromagnetic) part of the temperature-dependent resistivity (Ï) curve (below TP) fits well with Ï(T)=Ï0+Ï2T2+Ï4.5T4.5, indicating the importance of grain/domain boundary effects and electron-magnon scattering processes in the conduction of these materials. On the other hand, in the high temperature (T>TP) paramagnetic insulating regime, the adiabatic small polaron and VRH models fit well, thereby indicating that polaron hopping might be responsible for the conduction mechanism.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
G. Venkataiah, P. Venugopal Reddy,