摘要
采用脉冲电子束沉积技术,在Si(100)单晶衬底上沉积庞磁电阻La0·67Ca0·33MnO3颗粒薄膜,并对它的磁学性能和电学输运性能进行了表征.研究晶界对庞磁电阻薄膜的物理性能的影响,结果表明,晶界的存在使得晶粒之间的耦合变弱,在变温磁化过程中表现出团簇玻璃态行为,金属—绝缘体转变温度(Tp)远远低于铁磁—顺磁转变温度(Tc).低温下电子输运具有弱局域化行为.在低磁场下,晶界的存在掩盖了La0·67Ca0·33MnO3的本征磁电阻行为.
La0.67Ca0.33MnO3 grain films have been grown by pulsed electron beam deposition technology, and their magnetic and electronic transport properties investigated in detail. The influence of grain boundaries on the physical properties of La0.67Ca0.33MnO3 grain films were studied. Grain boundaries weaken the coupling between grains, resulting in a cluster spin glass state. The metal-insulator transition temperature （ Tp ） was shifted far below the ferromagnetic-paramagnetic transition temperature （Tc）. At low temperatures ,the electron transportation indicates a weak localization behavior, and under low magnetic fields, the intrinsic magnetoresisance effect is screened by the influence of grain boundaries.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期2328-2332,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60571029)
浙江省自然科学基金重点项目(批准号:Z605131)
中国科学院百人计划
国家自然科学基金优秀创新研究群体项目(批准号:60321001)资助的课题~~
关键词
脉冲电子束沉积
晶界
磁学和电学输运性能
庞磁电阻
pulsed electron beam deposition, grain boundaries, magnetic and transport properties, colossal magnetoresistance
