摘要
Ｌａ_（０．３３）Ｃａ_（０．６７）ＭｎＯ_３钙钛矿中电荷有序的结构模型是当前凝聚态物理学研究热点之一，前人的工作在这方面有很大的分歧．本文用透射电子显微术证实了横向位移的Ｗｉｇｎｅｒ晶体模型，否定了纵向位移的双条带（ｂｉ－ｓｔｒｉｐｅ）模型．在电荷有序的Ｌａ_（０．３３）Ｃａ_（０．６７）ＭｎＯ_３中发现了非公度调制和在电荷有序过程中生成的位移矢量为ａｃｏ／３的反相畴．
Structure model of charge-ordered La_(0.33)Ca_(0.67)MnO_3 perovskite is one of current focusedstudy in condensed matter physics. There are great discrepancies in previous studies in this field. Ourtransmission electron microscopy study confirms Wigner crystal model with transverse displacement and isnot consisent with the bi-stripe model with longitudinal displacement. We observed incommensurate modulation and anti-phase domains with a displacement vector aco/3 in charge-ordered La_(0.33)Ca_(0.67)MnO_3 perovskite.
出处
《武汉大学学报（自然科学版）》
CSCD
2000年第1期79-83,共5页
Journal of Wuhan University(Natural Science Edition)
基金
国家自然科学基金!(19974031)
关键词
电荷有序
钙钛矿结构
电子显微学
畴结构
charge-ordering
perovskite structure
La_(0.33)Ca_(0. 67_ MnO_3
electron microscopy
domain structuresition metal oxides
colossal magnetoresistance
