中国物理B ›› 2000, Vol. 9 ›› Issue (8): 624-629.doi: 10.1088/1009-1963/9/8/014
陈玲, 黄玉珍, 周放, 董成, 车广灿, 赵忠贤
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)
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.
中图分类号: (Superconductivity phase diagrams)