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Chinese Physics, 2000, Vol. 9(8): 624-629    DOI: 10.1088/1009-1963/9/8/014
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
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.
Keywords:  electrochemical oxidation      La2CuO4 crystals  
Received:  07 March 2000      Revised:  21 April 2000      Accepted manuscript online: 
PACS:  74.25.Dw (Superconductivity phase diagrams)  
  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
  74.72.Dn  
  81.10.Dn (Growth from solutions)  
  81.65.Mq (Oxidation)  
  82.45.-h (Electrochemistry and electrophoresis)  
Fund: Project supported by the Chinese National Center for Research and Development on Superconductivity.

Cite this article: 

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) ELECTROCHEMICAL OXIDATION OF La2CuO4 SINGLE CRYSTALS 2000 Chinese Physics 9 624

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