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Gigahertz longitudinal acoustic phonons originating from ultrafast ligand field transitions in hematite thin films

Chinese Physics B 2014年第4期23卷 288-291页

作者：徐悦金钻明张郑兵张泽宇林贤马国宏程振祥 Laboratory of Ultrafast Photonics Department of Physics Shanghai University Max Planck Institute for Polymer Research Ackermannweg 1055128 Mainz Germany Institute for Superconductor and Electronic Materials University of Wollongong Squires Way

The creation and propagation of longitudinal acoustic phonons （LAPs） in high quality hematite thin films （α-Fe203） epitaxially grown on different substrates （BaTiO3, SrTiO3, and LaAlO3） are investigated using the femtosecond pump- probe technique. Transient reflection measurements （AR/R） indicate the photo-excited electron dynamics, and the initial decay less than 1 ps and the slow decay of -500 ps are attributed to the electron-LO phonon coupling and electron-hole nonradiative recombination, respectively. LAPs in α-Fe2O3 film can be created by ultrafast excitation of the ligand field state, such as the ligand field transitions under 800-nm excitation as well as the ligand to metal charge-transfer with 400- nm excitation. The strain modulations of the sound velocity and the out-of-plane elastic properties are demonstrated in α-Fe2O3 film on different substrates.

关键词： α-Fe2O3 pump-probe technique acoustic phonons ligand field

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Elastic,dielectric,and piezoelectric characterization of 0.92Pb(Zn_(1/3) Nb_(2/3))O_3-0.08PbTiO_3 single crystal by Brillouin scattering

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Chinese Physics B 2015年第2期24卷 432-435页

作者：方绍熙汤冬云陈昭明张华刘玉龙 Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent TechnologyChinese Academy of Sciences

In this paper,a complete set of elastic,piezoelectric,and dielectric constants of high-quality tetragonal poled0.92Pb（Zn1/3Nb2/3）O3-0.08PbTiO3 single crystal grown by the modified flux method is determined using high-resolution Brillouin scattering.A comparison is made between the results obtained by a hybrid method combining ultrasonic and resonant techniques and the results obtained by the Brillouin *** elastic,piezoelectric,and dielectric constants obtained by the two methods are *** Brillouin spectrum consists of one longitudinal and two transverse acoustic phonon modes,and the variations of the Brillouin shifts,the full widths at half maximum,and the scattering intensities of these modes with scattering angle 9 are *** particular,the transverse acoustic phonon mode at the lowfrequency becomes markedly soft from 28.2 GHz to 18.4 GHz and broadens gradually with the increase of θ,while its intensity decreases gradually as compared with that of the original *** possible origins of the results are discussed.

关键词： ferroelectric relaxor high-resolution Brillouin scattering acoustic phonons

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