Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-02-01
J. Appl. Phys. volume 85, page 6563 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 6 eps figures, to be published in Journal of Applied Physics
Scientific paper
10.1063/1.370162
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.
Broussard P. R.
Browning V. M.
Cestone V. C.
Qadri Syen B.
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