Temperature-dependent far-infrared properties of Bi12GeO20 single crystal

doi:10.1088/1674-1056/18/10/053

中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4425-4429.doi: 10.1088/1674-1056/18/10/053

Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal

Muhammad Kamran, 戴耀民, 马继云, 李博宏, 何世坤, 张伟君, 郑小睿, 邱祥冈

Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China

收稿日期:2009-04-27 修回日期:2009-05-21 出版日期:2009-10-20 发布日期:2009-10-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No 10674168) and Ministry of Science and Technology, China (Grant Nos 2006CB601006 and 2009CB930701).

Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal

Muhammad Kamran, Dai Yao-Min(戴耀民), Ma Ji-Yun(马继云), Li Bo-Hong(李博宏), He Shi-Kun(何世坤), Zhang Wei-Jun(张伟君), Zheng Xiao-Rui(郑小睿), and Qiu Xiang-Gang(邱祥冈)^†

Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China

Received:2009-04-27 Revised:2009-05-21 Online:2009-10-20 Published:2009-10-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No 10674168) and Ministry of Science and Technology, China (Grant Nos 2006CB601006 and 2009CB930701).

摘要/Abstract

摘要： Far-infrared reflectivity spectra of bismuth germanium oxide (Bi₁₂GeO₂₀) single crystals are measured from room temperature down to 10~K. All the reflectivity spectra are fitted to a complex dielectric function ε(ω) in the factorised form. Phonon modes at low frequency are found to develop upon decreasing temperature and gain considerable spectrum weight below 150~K. The temperature-dependent static dielectric constants are obtained from the Lyddane--Sachs--Teller relation based on the obtained oscillator parameters. The dielectric constants are found to increase upon decreasing temperature, which is attributed to the charge transfer among the ions in the unit cell with the temperature varying.

Abstract: Far-infrared reflectivity spectra of bismuth germanium oxide (Bi₁₂GeO₂₀) single crystals are measured from room temperature down to 10 K. All the reflectivity spectra are fitted to a complex dielectric function $\varepsilon(\omega)$ in the factorised form. Phonon modes at low frequency are found to develop upon decreasing temperature and gain considerable spectrum weight below 150 K. The temperature-dependent static dielectric constants are obtained from the Lyddane--Sachs--Teller relation based on the obtained oscillator parameters. The dielectric constants are found to increase upon decreasing temperature, which is attributed to the charge transfer among the ions in the unit cell with the temperature varying.

Key words: infrared reflectivity, dielectric properties, phonon

中图分类号: (Other nonmetallic inorganics)

78.30.Hv

63.20.-e (Phonons in crystal lattices) 77.22.Ch (Permittivity (dielectric function))

Muhammad Kamran, 戴耀民, 马继云, 李博宏, 何世坤, 张伟君, 郑小睿, 邱祥冈. Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal[J]. 中国物理B, 2009, 18(10): 4425-4429.

Muhammad Kamran, Dai Yao-Min(戴耀民), Ma Ji-Yun(马继云), Li Bo-Hong(李博宏), He Shi-Kun(何世坤), Zhang Wei-Jun(张伟君), Zheng Xiao-Rui(郑小睿), and Qiu Xiang-Gang(邱祥冈). Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal[J]. Chin. Phys. B, 2009, 18(10): 4425-4429.

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Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal

Temperature-dependent far-infrared properties of Bi₁₂GeO₂₀ single crystal

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