Physics – Condensed Matter – Materials Science
Scientific paper
2000-01-25
Eur. Phys. J. B, vol.15, pp 461-468 (2000)
Physics
Condensed Matter
Materials Science
RevTex, 22 pages, 3 Postscript figures, submitted to Eur. Phys. J. B
Scientific paper
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.
Belevtsev B. I.
Bobkov V. V.
Krasovitsky V. B.
Naugle D. G.
Parasiris A.
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