Generation and detection of coherent longitudinal acoustic phonons in the la 0.67Sr 0 33MnO 3 thin films by femtosecond light pulses

Y. H. Ren; M. Trigo; R. Merlin; Venimadhav Adyam; Qi Li

doi:10.1063/1.2751130

Generation and detection of coherent longitudinal acoustic phonons in the la _0.67Sr _{0 33}MnO ₃ thin films by femtosecond light pulses

Y. H. Ren, M. Trigo, R. Merlin, Venimadhav Adyam, Qi Li

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32 Scopus citations

Abstract

The authors report on an anomalous first-to-zero sound crossover in the colossal magnetoresistance compound La _0.67Sr _0.33MnO ₃ (LSMO) using ultrafast time-resolved optical techniques. Two-color pump-probe setup was employed to record the photoinduced reflectance oscillations due to excitations of longitudinal acoustic phonons. By changing the sample thickness and probe wavelength, they determine the longitudinal sound velocities of both the thin film, and substrate. The values of the sound velocity in LSMO at gigahertz frequencies are more than 20% larger than those from ultrasound experiments in the megahertz regime near T _C. The results show the possible existence of dynamic polaron correlations in LSMO.

Original language	English (US)
Article number	251918
Journal	Applied Physics Letters
Volume	90
Issue number	25
DOIs	https://doi.org/10.1063/1.2751130
State	Published - 2007

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2751130

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title = "Generation and detection of coherent longitudinal acoustic phonons in the la 0.67Sr 0 33MnO 3 thin films by femtosecond light pulses",

abstract = "The authors report on an anomalous first-to-zero sound crossover in the colossal magnetoresistance compound La 0.67Sr 0.33MnO 3 (LSMO) using ultrafast time-resolved optical techniques. Two-color pump-probe setup was employed to record the photoinduced reflectance oscillations due to excitations of longitudinal acoustic phonons. By changing the sample thickness and probe wavelength, they determine the longitudinal sound velocities of both the thin film, and substrate. The values of the sound velocity in LSMO at gigahertz frequencies are more than 20% larger than those from ultrasound experiments in the megahertz regime near T C. The results show the possible existence of dynamic polaron correlations in LSMO.",

author = "Ren, {Y. H.} and M. Trigo and R. Merlin and Venimadhav Adyam and Qi Li",

note = "Funding Information: The authors gratefully acknowledge support from the Petroleum Research Fund (Hunter College and PSU) and NSF MRSEC seed grant (PSU). Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

year = "2007",

doi = "10.1063/1.2751130",

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volume = "90",

journal = "Applied Physics Letters",

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T1 - Generation and detection of coherent longitudinal acoustic phonons in the la 0.67Sr 0 33MnO 3 thin films by femtosecond light pulses

AU - Ren, Y. H.

AU - Trigo, M.

AU - Merlin, R.

AU - Adyam, Venimadhav

AU - Li, Qi

N1 - Funding Information: The authors gratefully acknowledge support from the Petroleum Research Fund (Hunter College and PSU) and NSF MRSEC seed grant (PSU). Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2007

Y1 - 2007

N2 - The authors report on an anomalous first-to-zero sound crossover in the colossal magnetoresistance compound La 0.67Sr 0.33MnO 3 (LSMO) using ultrafast time-resolved optical techniques. Two-color pump-probe setup was employed to record the photoinduced reflectance oscillations due to excitations of longitudinal acoustic phonons. By changing the sample thickness and probe wavelength, they determine the longitudinal sound velocities of both the thin film, and substrate. The values of the sound velocity in LSMO at gigahertz frequencies are more than 20% larger than those from ultrasound experiments in the megahertz regime near T C. The results show the possible existence of dynamic polaron correlations in LSMO.

AB - The authors report on an anomalous first-to-zero sound crossover in the colossal magnetoresistance compound La 0.67Sr 0.33MnO 3 (LSMO) using ultrafast time-resolved optical techniques. Two-color pump-probe setup was employed to record the photoinduced reflectance oscillations due to excitations of longitudinal acoustic phonons. By changing the sample thickness and probe wavelength, they determine the longitudinal sound velocities of both the thin film, and substrate. The values of the sound velocity in LSMO at gigahertz frequencies are more than 20% larger than those from ultrasound experiments in the megahertz regime near T C. The results show the possible existence of dynamic polaron correlations in LSMO.

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Generation and detection of coherent longitudinal acoustic phonons in the la _0.67Sr _{0 33}MnO ₃ thin films by femtosecond light pulses

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