| Autor: |
V. V. Bobkov, A. Parasiris, D. G. Naugle, K. D. D. Rathnayaka, B. I. Belevtsev, V. B. Krasovitsky |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
The European Physical Journal B. 15:461-468 |
| ISSN: |
1434-6028 |
| DOI: |
10.1007/pl00011046 |
| Popis: |
The effect of crystal lattice disorder on the conductivity and colossal magnetoresistance in La_{1-x}Ca_{x}MnO_{3} (x \approx 0.33) films has been examined. The lattice defects are introduced by irradiating the film with high-energy (\simeq 6 MeV) electrons with a maximal fluence of about 2\times 10^{17} 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 T_{c}) was much greater than that observed in the insulating state (above T_{c}). At the same time irradiation has much less effect on T_{c} or on the magnitude of the colossal magnetoresistance. A possible explanation of such behavior is proposed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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