【摘要】 分别采用溶胶-凝胶法和脉冲激光沉积的方法制备了La0·67Sr0·33FexMn1-xO3(x=0,0·05,0·10,0·15)系列块材和薄膜,研究了Fe部分替代对La0·67Sr0·33FexMn1-xO3薄膜输运和光诱导特性的影响.研究表明,随着Fe含量的增加,薄膜的峰值转变温度下降,导电性降低.在激光作用下,薄膜在T<TP时表现为光致电阻率增大,而在高温段(T>TP)则减小,随着Fe掺杂量的增加,光致电阻相对变化极值增加,当x=0·15时,光致电阻变化率极大值达到38%.并从晶格效应的角度讨论了光诱导薄膜电阻率变化的内在机理.更多还原

【Abstract】 The compounds and films of La₀.67Sr₀.33Fe_xMn₁-xO₃（x=0, 0.05, 0.10, 0.15） were prepared by the sol-gel technique and pulsed laser deposition method, respectively. The effect of Fe doping on the transport and photo-induced properties of La₀.67Sr₀.33Fe_xMn₁-xO₃ film was investigated. Experimental results indicate that the Fe doping lowers the insulator-metal transition temperature, but increases the resistance. The photo-induced relative change in resistance increases initially with increasing temperature, then followed by a decrease.The maximum value of the relative change in resistance increases with increasing x, it reaching 38% when x =0.15. The intriguing mechanism of photo-induced effect on the resistance was discussed in connection with lattice effect.更多还原