ELECTROCHEMICAL OXIDATION OF La2CuO4 SINGLE CRYSTALS

doi:10.1088/1009-1963/9/8/014

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

ELECTROCHEMICAL OXIDATION OF La₂CuO₄ SINGLE CRYSTALS

陈玲, 黄玉珍, 周放, 董成, 车广灿, 赵忠贤

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)

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/Abstract

摘要： Bulk superconducting La₂CuO_{4+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 T_c of 19K and δ-0.12 can be attributed to the formation of oxygen clusters. Room temperature oxidation is inhomogeneous: two superconducting phases with T_{c1<\sub> of 24K and T_{c2<\sub> of 8K and an antiferromagnetic phase are coexisting in the crystal. It is found that the appearance of T_c in this system has the "step" tendency.}}}

Abstract: Bulk superconducting La2CuO_4+$\delta$ 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 T_cof 19K and $\delta$-0.12 can be attributed to the formation of oxygen clusters. Room temperature oxidation is inhomogeneous: two superconducting phases with T_c1 of 24K and T_c2 of 8K and an antiferromagnetic phase are coexisting in the crystal. It is found that the appearance of T_cin 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)

陈玲, 黄玉珍, 周放, 董成, 车广灿, 赵忠贤. ELECTROCHEMICAL OXIDATION OF La₂CuO₄ SINGLE CRYSTALS[J]. 中国物理B, 2000, 9(8): 624-629.

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[J]. Chinese Physics, 2000, 9(8): 624-629.

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ELECTROCHEMICAL OXIDATION OF La₂CuO₄ SINGLE CRYSTALS

ELECTROCHEMICAL OXIDATION OF La₂CuO₄ SINGLE CRYSTALS

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