Oxygen vacancy effect on ultra-fast carrier dynamics of perovskite oxide La0.7Sr0.3MnO3 thin films

S. Yousefi; R. Trappen; N. Mottaghi; A. D. Bristow; M. B. Holcomb

doi:10.1117/12.2550978

27 February 2020 Oxygen vacancy effect on ultra-fast carrier dynamics of perovskite oxide La_0.7Sr_0.3MnO₃ thin films

S. Yousefi, R. Trappen, N. Mottaghi, A. D. Bristow, M. B. Holcomb

Proceedings Volume 11278, Ultrafast Phenomena and Nanophotonics XXIV; 112780P (2020) https://doi.org/10.1117/12.2550978
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Complex oxide thin films, such as La_0.7Sr_0.3MnO₃ (LSMO), are widely studied for a variety of applications. Transient reflectivity (TR) measurements on LSMO indicate enhanced surface recombination of charge carriers in films less than 20 nm in thickness. Oxygen growth pressure variation illustrates that higher oxygen pressures provide more electron dominance in the system, and producing a larger band filling effect which eventually results in higher excitations. Wavelet analysis can distinguish abrupt oscillatory modes with close energy ranges and have been introduced as a method to study sound velocities in ultra-thin films.

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S. Yousefi, R. Trappen, N. Mottaghi, A. D. Bristow, and M. B. Holcomb "Oxygen vacancy effect on ultra-fast carrier dynamics of perovskite oxide La_0.7Sr_0.3MnO₃ thin films", Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 112780P (27 February 2020); https://doi.org/10.1117/12.2550978

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