Coherent acoustic phonons in YBa2Cu3O7/La1/3Ca2/3MnO3 superlattices

被引：0
作者：
Li, Wei [1 ,2 ]
He, Bin [1 ]
Zhang, Chunfeng [1 ]
Liu, Shenghua [1 ]
Liu, Xiaoran [3 ]
Middey, S. [3 ]
Chakhalian, J. [3 ]
Wang, Xiaoyong [1 ]
Xiao, Min [1 ,3 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Inst Signal Proc & Transmiss, Nanjing 210003, Jiangsu, Peoples R China
[3] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA
来源：
APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 13期
基金：
美国国家科学基金会;
关键词：
PICOSECOND LIGHT-PULSES; MULTIPLE-QUANTUM WELLS; THERMAL-CONDUCTIVITY; SEMICONDUCTOR SUPERLATTICES; GAAS/ALAS SUPERLATTICES; OXIDE SUPERLATTICES; BAND-STRUCTURE; DYNAMICS; SPECTROSCOPY; OSCILLATION;
D O I：
10.1063/1.4945333
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigate photo-induced coherent acoustic phonons in complex oxide superlattices consisting of high-Tc superconductor YBa2Cu3O7-x and ferromagnetic manganite La1/3Ca2/3MnO3 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. (C) 2016 AIP Publishing LLC.
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页数：5
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