Characterization of transport and magnetic properties in thin film La0.67(CaxSr1−x)0.33MnO3 mixtures
| Autor: | V. C. Cestone, P. R. Broussard, V. M. Browning, Syed B. Qadri |
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| Rok vydání: | 1999 |
| Předmět: |
Condensed Matter - Strongly Correlated Electrons
Materials science Strongly Correlated Electrons (cond-mat.str-el) Magnetoresistance Sputtering Electrical resistivity and conductivity Lattice (order) Analytical chemistry Temperature independent FOS: Physical sciences General Physics and Astronomy Field dependence Thin film |
| Zdroj: | Journal of Applied Physics. 85:6563-6566 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.370162 |
| Popis: | We have grown thin films of (100) oriented La_{0.67}(Ca_{x}Sr_{1-x})_{0.33}MnO_{3} on (100) NdGaO_{3} substrates by off-axis sputtering. We have looked at the changes in the resistivity and magnetoresistance of the samples as the Ca/Sr ratio was varied. We find that as the calcium fraction is decreased, the lattice match to the substrate decreases, and the films become more disordered, as observed in transport measurements and the variation in Curie and peak resistance temperatures. We find a correlation between the temperature independent and T^2 terms to the low temperature resistivity. The room temperature magnetoresistance exhibits a maximum as the peak temperature is increased by the substitution of Sr for Ca, and a change in the field dependence to the resistivity at room temperature is observed. 5 pages, 6 eps figures, to be published in Journal of Applied Physics |
| Databáze: | OpenAIRE |
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