中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3313-3317.doi: 10.1088/1674-1056/17/9/028

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Temperature dependent phonon modes and ionicity of LiGaO2 single crystal

马继云, 方煦, M. Kamran, 赵华英, 毕聪志, 赵柏儒, 邱祥冈   

  1. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
  • 收稿日期:2008-03-12 修回日期:2008-03-27 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10474128).

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)†   

  1. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
  • Received:2008-03-12 Revised:2008-03-27 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10474128).

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摘要： 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.

关键词: infrared, optical conductivity, LiGaO2 single crystal, phonon

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.

Key words: infrared, optical conductivity, LiGaO2 single crystal, phonon

中图分类号:  (Phonons in crystal lattices)

  • 63.20.-e
78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 78.30.Hv (Other nonmetallic inorganics)