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Author Li, Wei ♦ He, Bin ♦ Zhang, Chunfeng ♦ Liu, Shenghua ♦ Wang, Xiaoyong ♦ Liu, Xiaoran ♦ Middey, S. ♦ Chakhalian, J. ♦ Xiao, Min
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABSORPTION ♦ BRILLOUIN EFFECT ♦ COUPLING ♦ EPITAXY ♦ INTERFACES ♦ LAYERS ♦ MODULATION ♦ OSCILLATION MODES ♦ OSCILLATIONS ♦ OXIDES ♦ PHONONS ♦ PROBES ♦ REFLECTION ♦ REFLECTIVITY ♦ SPECTRA ♦ SPECTROSCOPY ♦ SUPERCONDUCTORS ♦ SUPERLATTICES ♦ TIME RESOLUTION
Abstract We investigate photo-induced coherent acoustic phonons in complex oxide superlattices consisting of high-Tc superconductor YBa{sub 2}Cu{sub 3}O{sub 7−x} and ferromagnetic manganite La{sub 1/3}Ca{sub 2/3}MnO{sub 3} epitaxial layers with broadband pump-probe spectroscopy. Two oscillatory components have been observed in time-resolved differential reflectivity spectra. Based on the analysis, the slow oscillation mode with a frequency sensitive to the probe wavelength is ascribed to the stimulated Brillouin scattering due to the photon reflection by propagating train of coherent phonons. The fast oscillation mode with a probe-wavelength-insensitive frequency is attributed to the Bragg oscillations caused by specular phonon reflections at oxide interfaces or the electron-coupling induced modulation due to free carrier absorption in the metallic superlattices. Our findings suggest that oxide superlattice is an ideal system to tailor the coherent behaviors of acoustic phonons and to manipulate the thermal and acoustic properties.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-03-28
Publisher Place United States
Journal Applied Physics Letters
Volume Number 108
Issue Number 13


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