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Growth and properties of crystals of Tl-Ba-Ca-Cu-O system

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【作者】 孟宪仁； 彭志强； 涂清云； 林明柱； 林振金； 桑丽华； 刘振兴；

【Author】 MENG Xianren PENG Zhiqiang TU Qingyun LIN Mingzhu LIN Zhenjin SANG Lihua(Department of Physics, Beijing Normal University, Beijing 100875, China)and LIU Zhenxing(Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)

【机构】 Department of Physics； Beijing Normal University； Beijing 100875； China； Institute of Physics； Chinese Academy of Sciences； Beijing 100080； China；

【摘要】 <正> Crystals of Tl-2223 and Tl-2212 have been successfully grown by self-flux method. The typical dimension in 1.0×1.0×0.1 mm3, and crystals as big as 2.0×2.0×0.3mm3 were also obtained. The transition temperature of crystals of Tl-2212 and Tl-2223 were 110 and 119K, respectively. Detailed studies on the effect of the cooling rate as well as Tl content were conducted. The results of X-ray diffraction experiments, SEM and EDX are also presented. AC susceptibility measurements were carried out on a Tl-2212 single crystal under various external magnetic fields applied normal to a-b plane. Measurements of reflectance spectra were also applied to a single crystal of Tl-2223 to investigate the optical anisotropy of Tl-2223.

【Abstract】 Crystals of Tl-2223 and Tl-2212 have been successfully grown by self-flux method. The typical dimension in 1.0×1.0×0.1 mm3, and crystals as big as 2.0×2.0×0.3mm3 were also obtained. The transition temperature of crystals of Tl-2212 and Tl-2223 were 110 and 119K, respectively. Detailed studies on the effect of the cooling rate as well as Tl content were conducted. The results of X-ray diffraction experiments, SEM and EDX are also presented. AC susceptibility measurements were carried out on a Tl-2212 single crystal under various external magnetic fields applied normal to a-b plane. Measurements of reflectance spectra were also applied to a single crystal of Tl-2223 to investigate the optical anisotropy of Tl-2223.

【关键词】 high temperature superconductor； crystal growth； Tl-Ba-Ca-Cu-O system； AC susceptibility； reflectance spectrum.；
【Key words】 high temperature superconductor； crystal growth； Tl-Ba-Ca-Cu-O system； AC susceptibility； reflectance spectrum.；
  • 【文献出处】 Science in China,Ser.A ,中国科学A辑(英文版) , 编辑部邮箱 ,1995年10期
  • 【分类号】O782
  • 【下载频次】8
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