Ag掺杂对La_(2/3)Ca_(1/3)MnO_3薄膜及激光感生电压效应的影响

Ag Doping Effects on La_(2/3)Ca_(1/3)MnO_3 Thin Films and Laser-Induced Voltage Effect

采用固相法烧结制备了Ag掺杂的La2/3Ca1/3MnO3(LCMO∶Agx,x为摩尔分数,x=0.00,0.05,0.10)多晶靶材,并利用此靶材采用脉冲激光沉积法(PLD)在0°和15°LaAlO3(100)单晶衬底(单面抛光)上于790℃和45 Pa流动氧压下制备了LCMO∶Agx外延薄膜,并于760℃和104Pa静态氧压下进行了30 min原位退火处理;X射线衍射(XRD)和ω-θ摇摆曲线分析表明所制备薄膜均沿[00l]方向生长,并且结晶质量较好,原子力显微镜(AFM)分析表明平均面光洁度较小,并且随Ag掺杂量的增加而变小;另外在倾斜衬底上生长的LCMO∶Agx薄膜上观察到激光感生电压(LIV)效应,并且随Ag掺杂浓度的增加,LCMO∶Agx薄膜的LIV信号的Up值先增大后减小,x=0.05时最大,x=0.10时最小,LIV信号响应时间τ则正好相反。

Ag doped La2/3Ca1/3MnO3（LCMO∶Agx） polycrystalline pellets,which are prepared by solid-state reaction,are employed to fabricate LCMO∶Agx epilayer on single crystalline LaAlO3（100） substrate by pulsed laser deposition technique.X-ray diffraction（XRD） and ω-θ rocking cure analysis show that all the films are c-oriented and presented good crystalline quality.The morphology of the as-grown films are detected by atomic force microscope（AFM）,and the results demonstrate that the surface roughness increases with increased Ag doping level,further,numerous laser droplets could be observed in all films.Laser induced voltage（LIV） effect is found in those films grown on the vicinal-cut LaAlO3（100） substrates,and with Ag content increasing,the peak value of LIV signal（Up） increases firstly and arrives to its maximum at x=0.05.Up decreases up to x=0.10 and gets its minimum at x=0.10,while Ag content dependence of response time τ of LIV signal just presents an opposite behavior.