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Complex Impedance Investigation of Epitaxial LCMO Thin Films

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Mateev E., Nurgaliev T., Blagoev B.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 3
787-790
EN
Epitaxial La_{0.67}Ca_{.33}MnO_3 (LCMO) thin films by off-axis magnetron sputtering were deposited on SrTiO_3 (STO) substrates. Complex impedance measurements (module and phase of the thin film impedance) in frequency range 1-30 kHz are done. Substantial dependence of both: module and phase of the complex surface impedance is observed. The temperature interval scanned is from 77 K to room temperature. The impedance has inductive behavior for temperatures less than the Curie temperature and capacitive for higher temperatures. Reduction of the film thickness from 60 to 30 nm shifts the impedance curves to the lower temperatures.
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