多近邻作用双原子链和一维铁电体晶格振动

DIATOMIC CHAIN WITH MULTI-NEIGHBORS INTERACTION AND LATTICE VIBRATION OF ONE-DIMENSIONAL FERROELECTRIC

用实空间方法研究了多近邻作用双原子链的晶格振动行为 ,该模型是铁电体的最简单近似 .研究表明长程库仑力确实是铁电相变软模的重要起因 。

The lattice vibratoin behavior of the diatomic chain model with multi neighbors was investigated using the real space method. This model is the simple approximation of the ferroelectric. The investigation demonstrates that the long range Coulomb force is really the important cause for the soft mode of phase transition. The new characteristic of the lattice vibration for the impurity was found.