中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2893-2897.doi: 10.1088/1674-1056/18/7/045

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Floating-zone growth and property characterizations of high-quality La2-xSrxCuO4 superconductor crystals

慎晓丽, 李正才, 申彩霞, 陆伟, 董晓莉, 周放, 赵忠贤   

  1. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2009-04-08 修回日期:2009-04-08 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 2006CB0L0302) and the National Natural Science Foundation of China (Grant No 10574149).

Floating-zone growth and property characterizations of high-quality La2-xSrxCuO4 superconductor crystals

Shen Xiao-Li(慎晓丽), Li Zheng-Cai(李正才), Shen Cai-Xia(申彩霞), Lu Wei(陆伟), Dong Xiao-Li(董晓莉), Zhou Fang(周放)†, and Zhao Zhong-Xian(赵忠贤)   

  1. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2009-04-08 Revised:2009-04-08 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 2006CB0L0302) and the National Natural Science Foundation of China (Grant No 10574149).

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摘要： We have grown underdoped (x = 0.11, 0.12) and optimally doped (x = 0.16) La2-xSrxCuO4 single crystals by the traveling-solvent floating-zone technique. In order to prepare good quality cuprate crystals, we have made much effort to optimize the preparation procedures. For example, we haveadopted the sol--gel route to prepare a highly fine and homogeneous La2-xSrxCuO4 precursor powder for fabricating a very dense ceramic feed rod used for the floating-zone growth, and we have also used quite a slow growth rate. The high quality of the grown crystals has been verified by double-crystal x-ray rocking curves, with the full-width-at-half-maximum being only 113--150 arcseconds, which are the best data reported so far for La2-xSrxCuO4 crystals. The superconducting critical temperatures of the grown crystals are 30, 31 and 38.5~K for x = 0.11, 0.12 and 0.16 samples, respectively, according to magnetic measurements.

Abstract: We have grown underdoped (x = 0.11, 0.12) and optimally doped (x = 0.16) La2-xSrxCuO4 single crystals by the traveling-solvent floating-zone technique. In order to prepare good quality cuprate crystals, we have made much effort to optimize the preparation procedures. For example, we haveadopted the sol--gel route to prepare a highly fine and homogeneous La2-xSrxCuO4 precursor powder for fabricating a very dense ceramic feed rod used for the floating-zone growth, and we have also used quite a slow growth rate. The high quality of the grown crystals has been verified by double-crystal x-ray rocking curves, with the full-width-at-half-maximum being only 113--150 arcseconds, which are the best data reported so far for La2-xSrxCuO4 crystals. The superconducting critical temperatures of the grown crystals are 30, 31 and 38.5 K for x = 0.11, 0.12 and 0.16 samples, respectively, according to magnetic measurements.

Key words: floating-zone crystal growth, sol--gel chemistry, x-ray rocking curves, superconductivity

中图分类号:  (Growth from melts; zone melting and refining)

  • 81.10.Fq
81.20.Fw (Sol-gel processing, precipitation) 74.62.-c (Transition temperature variations, phase diagrams) 74.25.Ha (Magnetic properties including vortex structures and related phenomena) 61.05.cp (X-ray diffraction)