Abstract
We have studied transport properties, including the thermopower and its field dependence, between 5 K and room temperature in films of Mn fabricated by simple metalorganic decomposition technique. A large negative magnetothermopower, , amounting to as much as 38% has been observed in addition to a large negative magnetoresistivity, , with a peak value of 70% in a field of 5 T. is found to correlate with in the form while scales with magnetization according to below the magnetic transition temperature. Above the transition , while displays Arrhenius behavior. All these facts are consistent with a picture of electrical conduction being dominated by magnetic polaron hopping which has its origin in the local magnetic order.
- Received 25 September 1995
DOI:https://doi.org/10.1103/PhysRevB.53.5094
©1996 American Physical Society