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Temperature dependence of Raman scattering in single crystal SnSe
Gong, Xiangnan1; Wu, Hong2; Yang, Dingfeng3; Zhang, Bin1; Peng, Kunling2; Zou, Hanjun1; Guo, Lijie2; Lu, Xu2; Chai, Yisheng2; Wang, Guoyu4
2020-03-01
摘要We report on the temperature-dependence Raman modes of in-plane B-g(3), A(g)(2) and out-of-plane A(g)(1), A(g)(3) in single crystals of tin selenide that grown by a modified home-made Bridgeman method. The samples are characterized by single crystal X-ray diffraction and high-resolution transmission electron microscopy to confirm their crystal structure. The temperature-dependence of Raman spectroscopy illustrates that A(g)(1), B-3(g), A(g)(2) and A(g)(3) modes are red-shifted and softened with increasing temperature from 77 K to 400 K. Large temperature coefficients for in-plane Raman modes are observed, say -4.13 x 10(-2) cm(-1)/K and -5.20 x 10(-2) cm(-1)/K for B-3g and A(g)(2) modes, respectively. The values for out-of-plane modes are much lower, say -0.91 x 10(-2) cm(-1)/K and -1.38 x 10(-2) cm(-1)/K for A(g)(1) and A(g)(3) modes, respectively. The result indicates intrinsic anisotropic Gruneisen parameter beta in SnSe, revealing the strong anisotropic lattice anharmonicity. Besides, coefficients of optical-phonon frequency with incident laser-power were (-0.87, -2.77, -2.18 and -1.08) cm(-1)/mW for A(g)(1), B-3g, A(g)(2) and A(g)(3) respectively for the laser-power dependent Raman spectroscopy experiments. Our work offers a new insight to understand the lattice anharmonicity via Raman spectroscopy and is conductive to search the new thermoelectric materials with intrinsic low lattice thermal conductivity.
关键词SnSe single crystal Temperature-dependent raman Laser-power-dependent raman Anharmonic effect
DOI10.1016/j.vibspec.2020.103034
发表期刊VIBRATIONAL SPECTROSCOPY
ISSN0924-2031
卷号107页码:6
通讯作者Chai, Yisheng(yschai@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000519527600017
语种英语