The optical response of 200 nm thick La0.7Sr0.3MnO(3 − δ) films, deposited by pulsed laser deposition on amorphous silica substrates heated at nearly 600 °C, under different oxygen pressures (0.1 Pa, 0.5 Pa, 1 Pa, 5 Pa and 10 Pa), is reported. The effects of the oxygen non-stoichiometry are investigated at room temperature dealing with the absorption coefficient and the Tauc's plotmethod rather than conventional optical conductivity. The absorption curves are evaluated by an algorithm able to realistically describe the behavior of thin films without exploiting numerical extrapolations or simplified theoretical models or ab-initio calculations. Optical features, tunable by the growth oxygen pressure, are discussed based on the known theoretical and experimental scenario
Optical response of oxygen deficient La0.7Sr0.3MnO3 thin films deposited by pulsed laser deposition
M. Cesaria;CARICATO, Anna Paola;LEGGIERI, Gilberto;MARTINO, Maurizio;MARUCCIO, Giuseppe
2013-01-01
Abstract
The optical response of 200 nm thick La0.7Sr0.3MnO(3 − δ) films, deposited by pulsed laser deposition on amorphous silica substrates heated at nearly 600 °C, under different oxygen pressures (0.1 Pa, 0.5 Pa, 1 Pa, 5 Pa and 10 Pa), is reported. The effects of the oxygen non-stoichiometry are investigated at room temperature dealing with the absorption coefficient and the Tauc's plotmethod rather than conventional optical conductivity. The absorption curves are evaluated by an algorithm able to realistically describe the behavior of thin films without exploiting numerical extrapolations or simplified theoretical models or ab-initio calculations. Optical features, tunable by the growth oxygen pressure, are discussed based on the known theoretical and experimental scenarioI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
