Temperature dependent phonon modes and ionicity of LiGaO2 single crystal
Ma Ji-Yun(马继云), Fang Xu(方煦), M. Kamran, Zhao Hua-Ying(赵华英), Bi Cong-Zhi(毕聪志), Zhao Bai-Ru(赵柏儒), and Qiu Xiang-Gang(邱祥冈)†
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
Abstract This paper reports that polarized far-infrared reflectivity measurements have been done on LiGaO2 single crystal along two crystalline axes at different temperatures. The temperature dependent frequencies of the longitudinal and transverse optical phonon have been obtained from the real part of optical conductivity and the loss function respectively. A small Drude component is observed at frequency below 300 cm$^{ - 1}$ which could arise from Li ions or oxygen deficiencies. The ionicity of LiGaO2 has been studied from the analysis of the Born effective charge of different ions.
Received: 12 March 2008
Revised: 27 March 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10474128).
Cite this article:
Ma Ji-Yun(马继云), Fang Xu(方煦), M. Kamran, Zhao Hua-Ying(赵华英), Bi Cong-Zhi(毕聪志), Zhao Bai-Ru(赵柏儒), and Qiu Xiang-Gang(邱祥冈) Temperature dependent phonon modes and ionicity of LiGaO2 single crystal 2008 Chin. Phys. B 17 3313
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