CAJ | 학술논문

采用射频(RF)磁控溅射法制备稀土掺杂铁氧化物La_(0.3)Sr_(0.7)FeO_3 (LSFO)薄膜.电阻-温度关系表明,薄膜在测量温度范围内呈现半导体导电特性,其主要源于Fe~(3+)和Fe~(5+)离子的电荷有序排列,同时薄膜在250 K时发生电荷有序态转变.激光作用诱导薄膜电阻减小,且光致电阻相对变化在190 K时取得极大值为56.3%.利用变程跳跃模型对电阻温度曲线进行分析讨论,表明激光作用的内在机制是激光辐照诱导电子退局域化.
채용사빈(RF)자공천사법제비희토참잡철양화물La_(0.3)Sr_(0.7)FeO_3 (LSFO)박막.전조-온도관계표명,박막재측량온도범위내정현반도체도전특성,기주요원우Fe~(3+)화Fe~(5+)리자적전하유서배렬,동시박막재250 K시발생전하유서태전변.격광작용유도박막전조감소,차광치전조상대변화재190 K시취득겁대치위56.3%.이용변정도약모형대전조온도곡선진행분석토론,표명격광작용적내재궤제시격광복조유도전자퇴국역화.
La_(0.3)Sr_(0.7)FeO_3 (LSFO) thin films were prepared by RF magnetron sputtering method. The resistance-temperature relation shows that the film favors the semiconductive conduction in the testing temperature range, which arises from the charge ordering of Fe~(3+) and Fe~(5+) ions. The charge ordering transition happened at T=250 K. The laser irradiation induces a decrease of the resistance of the film and the maximum relative change in the photoinduced resistance is about 56.3% at T=190 K. The analysis of the resistance-temperature relation using the variable range hoping (VRH) model shows that the intrinsic mechanism of the laser irradiation is the delocalization of the electrons.