Influence of high-energy electron irradiation on the transport properties of La1-xCaxMnO3 films (x ≈ 1/3)
B. I. Belevtsev, V. B. Krasovitsky, V. V. Bobkov, D. G. Naugle, K. D. D. Rathnayaka, A. Parasiris
Abstract
The effect of crystal lattice disorder on the conductivity and colossal magnetoresistance in La1-xCaxMnO3 (x ≈ 0.33) films has been examined. The lattice defects are introduced by irradiating the film with high-energy ( 6 MeV) electrons with a maximal fluence of about 2× 1017 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. Nethertheless, this results in an appreciable increase in the film resistivity. The percentage of resistivity increase in the ferromagnetic metallic state (below the Curie tempetature Tc) was much greater than that observed in the insulating state (above Tc). At the same time irradiation has much less effect on Tc or on the magnitude of the colossal magnetoresistance. A possible explanation of such behavior is proposed.
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