Anomalous in-plane magnetoresistance of electron-doped cuprate La2-xCexCuO4±δ

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2017,（9）
• 页码范围: 70-75
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11433-017-9050-7

摘要

We report systematic in-plane magnetoresistance measurements on the electron-doped cuprate La2-xCexCuO4±δ thin films as a function of Ce doping and oxygen content in the magnetic field up to 14T.A crossover from negative to positive magnetoresistance occurs between the doping level x =0.07 and 0.08.Above x =0.08,the positive magnetoresistance effect appears,and is almost indiscernible at x =0.15.By tuning the oxygen content,the as-grown samples show negative magnetoresistance effect,whereas the optimally annealed ones display positive magnetoresistance effect at the doping level x =0.15.Intriguingly,a linear-field dependence of in-plane magnetoresistance is observed at the underdoping level x =0.06,the optimal doping level x =0.1 and slightly overdoping level x =0.11.These anomalies of in-plane magnetoresistance may be related to the intrinsic inhomogeneity in the cuprates,which is discussed in the framework of network model.