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Pr2/3Sr1/3MnO3薄膜外场诱导自旋输运特性
引用本文:赵省贵,陈长乐,金克新.Pr2/3Sr1/3MnO3薄膜外场诱导自旋输运特性[J].无机材料学报,2008,23(2):281-285.
作者姓名:赵省贵  陈长乐  金克新
作者单位:1. 西北工业大学理学院应用物理系,西安710072;西安科技大学,基础部,西安,710054
2. 西北工业大学理学院应用物理系,西安,710072
摘    要:采用脉冲激光沉积法制备了稀土掺杂钙钛矿锰氧化物Pr2/3Sr1/3MnO3(PSMO)外延薄膜,研究了薄膜在磁场、激光和电流作用下的自旋输运特性.在低温铁磁金属相,激光作用使薄膜的电阻增大,而磁场和电流则诱导电阻减小;在高温顺磁绝缘态,外场诱导均使电阻减小.在铁磁金属相,外场诱导输运特性的变化可归结于外场对体系电子自旋系统的影响:磁场和电流加强材料中eg电子和t2g局域电子间的自旋平行,增强了双交换作用;激光作用可产生光致退磁效应,减弱双交换作用.在顺磁绝缘态,场致电阻降低源于外场致使小极化子的退局域化效应.

关 键 词:锰氧化物薄膜  场诱导效应  自旋输运特性  小极化子  薄膜  外场诱导  自旋输运特性  Transport  Properties  Spin  Induced  Field  局域化效应  小极化子  场致  退磁效应  双交换作用  增强  加强材料  影响  自旋系统  电子  体系  变化  铁磁
文章编号:1000-324X(2008)02-0281-05
收稿时间:2007-2-11
修稿时间:2007年2月11日

Field Induced Spin Transport Properties in Pr2/3Sr1/3MnO3 Film
ZHAO Sheng-Gui,CHEN Chang-Le,JIN Ke-Xin.Field Induced Spin Transport Properties in Pr2/3Sr1/3MnO3 Film[J].Journal of Inorganic Materials,2008,23(2):281-285.
Authors:ZHAO Sheng-Gui  CHEN Chang-Le  JIN Ke-Xin
Abstract:The doped manganites Pr2/3Sr1/3MnO3 (PSMO)film was prepared by the pulsed laser deposition method. The spin transport properties of the film induced by the magnetic field, laser and the current field were investigated. In ferromagnetic metallic state, the laser irradiation results in the increase of the resistance, which is attributed to the photoinduced demagnetization effect. But the magnetic field and the current induce the resistance decrease because the magnetic field and the current align the magnetic moments of the nearest Mn ions and enhance the double-exchange effect. In the paramagnetic insulating phase, the three external fields induce the decrease in the resistance, which is due to the field-induced delocalization of the small polarons.
Keywords:manganites film  field induced effect  spin transport  small polarons
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