ISSN:
1434-6036
Keywords:
PACS. 75.30.Vn Colossal magnetoresistance - 72.80.Ga Transition-metal compounds - 72.60.+g Mixed conductivity and conductivity transitions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: The effect of crystal lattice disorder on the conductivity and colossal magnetoresistance in La1-xCaxMnO3 ( ) films has been examined. The lattice defects are introduced by irradiating the film with high-energy ( MeV) electrons with a maximal fluence of about cm-2. This comparatively low dose of irradiation produces rather small radiation damage in the films. The number of displacements per atom (dpa) in the irradiated sample is about 10-5. Nevertheless, this results in an appreciable increase in the film resistivity. The percentage of the resistivity increase in the ferromagnetic metallic state (below the Curie temperature ) was much greater than that observed in the insulating state (above ). At the same time irradiation has much less effect on or on the magnitude of the colossal magnetoresistance. A possible explanation of such behavior is proposed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00011046
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