机构:
UGC DAE Consortium Sci Res, Indore 452017, Madhya Pradesh, IndiaSardar Patel Univ, Dept Phys, Vallabh Vidyanagar 388120, Gujarat, India
Sathe, Vasant
[2
]
Rao, Rekha
论文数: 0引用数: 0
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机构:
Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, IndiaSardar Patel Univ, Dept Phys, Vallabh Vidyanagar 388120, Gujarat, India
Bi2Se3 single crystal;
High pressure;
Low temperature;
Anharmonic effects;
OPTICAL-PROPERTIES;
PHONONS;
SB2TE3;
GROWTH;
BI2TE3;
SB2SE3;
D O I:
10.1016/j.physb.2013.10.008
中图分类号:
O469 [凝聚态物理学];
学科分类号:
070205 ;
摘要:
We report here on Raman spectroscopic studies of Bi2Se3 single crystal synthesized by chemical vapor transport technique as a function of pressure (0-12 GPa) and temperature (80-300 K). Polarized Raman experiments in the back-scattering configuration were performed to determine the position of the two dominant first-order Raman-active modes, E-g(4) and A(1g)(2) at around 132 and 174 cm(-1) respectively. High pressure Raman measurements provides the evidence that Bi2Se3 single crystal undergoes first order phase transition above 10 GPa. Isobaric and isothermal mode Gruneisen parameter have been determined from the temperature and pressure dependent Raman spectra for both Raman active modes of Bi2Se3 single crystal. The analysis of the experimental data showed that the temperature dependencies of the phonon frequencies and linewidths were well described by considering the contributions from thermal expansion and lattice anharmonicity. (C) 2013 Elsevier B.V. All rights reserved