中国物理B ›› 2000, Vol. 9 ›› Issue (8): 624-629.doi: 10.1088/1009-1963/9/8/014

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ELECTROCHEMICAL OXIDATION OF La2CuO4 SINGLE CRYSTALS

陈玲, 黄玉珍, 周放, 董成, 车广灿, 赵忠贤   

  1. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2000-03-07 修回日期:2000-04-21 出版日期:2000-08-15 发布日期:2005-06-10
  • 基金资助:
    Project supported by the Chinese National Center for Research and Development on Superconductivity.

ELECTROCHEMICAL OXIDATION OF La2CuO4 SINGLE CRYSTALS

Chen Ling (陈玲), Huang Yu-zhen (黄玉珍), Zhou Fang (周放), Dong Cheng (董成), Che Guang-can (车广灿), Zhao Zhong-xian (赵忠贤)   

  1. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2000-03-07 Revised:2000-04-21 Online:2000-08-15 Published:2005-06-10
  • Supported by:
    Project supported by the Chinese National Center for Research and Development on Superconductivity.

摘要: Bulk superconducting La2CuO4+δ<\sub> single crystals are obtained by using electrochemical intercalation technique from the as-grown insulating samples. Oxidation is carried out by constant current I=10μA at temperature T=70℃ and room temperature, respectively. Structure and magnetic properties are studied by low-temperature X-ray diffraction and susceptibility measurements. A superconducting phase with Tc of 19K and δ-0.12 can be attributed to the formation of oxygen clusters. Room temperature oxidation is inhomogeneous: two superconducting phases with Tc1<\sub> of 24K and Tc2<\sub> of 8K and an antiferromagnetic phase are coexisting in the crystal. It is found that the appearance of Tc in this system has the "step" tendency.

Abstract: Bulk superconducting La2CuO4+$\delta$ single crystals are obtained by using electrochemical intercalation technique from the as-grown insulating samples. Oxidation is carried out by constant current I=10 μA at temperature T=70℃ and room temperature, respectively. Structure and magnetic properties are studied by low-temperature X-ray diffraction and susceptibility measurements. A superconducting phase with Tof 19K and $\delta$-0.12 can be attributed to the formation of oxygen clusters. Room temperature oxidation is inhomogeneous: two superconducting phases with Tc1 of 24K and Tc2 of 8K and an antiferromagnetic phase are coexisting in the crystal. It is found that the appearance of Tin this system has the "step" tendency.

Key words: electrochemical oxidation, La2CuO4 crystals

中图分类号:  (Superconductivity phase diagrams)

  • 74.25.Dw
74.25.Ha (Magnetic properties including vortex structures and related phenomena) 81.10.Dn (Growth from solutions) 81.65.Mq (Oxidation) 82.45.-h (Electrochemistry and electrophoresis)