Microstructure and Magnetization Investigations of Cu-Doping Effect on La2CuO4+δ Crystal
DONG Xiao-li1,2, ZHAO Bai-ru1, ZHAO zhong-xian1, LIU Wei1, ZHOU Lei1, XU Bo1, CHEN Hong1, CHE Guang-can1, NI Yong-ming1, YIN Bo1, LI Jing-wei1, ZHAO Li-hua2, XU Zhong-yu2
1National Laboratory for Superconductivity, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Hunan University, Changsha 410012
Microstructure and Magnetization Investigations of Cu-Doping Effect on La2CuO4+δ Crystal
1National Laboratory for Superconductivity, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Hunan University, Changsha 410012
Abstract： Measurement and characterization were carried out on Cu-doped and undoped La2CuO4+δ samples prepared under the same conditions. The magnetization measurement on the Cu-doped La2CuO4+δ sample shows coexistence of long-range antiferromagnetic order and superconductivity. A stripe-like structure was observed at room temperature on the ab-plane of Cu-doped La2CuO4+δ sample by transmission electron microscope. While for the undoped La2CuO4+δ sample no such behavior or structure feature was found. In this letter, these phenomena were discussed in terms of phase separation.
1997, Vol. 14 
