Tensile-strain induced phonon splitting in diamond
Meifang Pu(蒲梅芳)1, Feng Zhang(张峰)1, Shan Liu(刘珊)1, Tetsuo Irifune(入舩徹男)2, Li Lei(雷力)1
1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
2 Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
The first-order Raman spectroscopy of diamond exhibits splitting and redshift after the burst of high-pressure (160-200 GPa) and high-temperature (~2000 K). The observed longitudinal optical (LO) and the transverse optical (TO) splitting of Raman phonon is related to the tensile-strain induced activation of the forbidden or silent Raman modes that arise in the proximity of the Brillouin zone center.
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