氢键铁电体中的孤子电导性

Gordon首先采用带有非对称双阱势的氢键链模型研究了氢键铁电体的电导性,给出了扭结解和迁移率的表达式.但是对于电导有贡献的扭结孤子应该对应于质子在两个阱底之间的转移,基于这种考虑,修正了Gordon的结果,重新导出了低能态的扭结解,给出了迁移率的一个新的表达式.当非对称双阱势转化为对称双阱势时,这个表达式恰与以前的研究结果一致.这个表达式表明,相变临界指数是1. 关键词： 氢键铁电体 铁电相 孤子迁移率

SOLITON CONDUCTIVITY IN HYDROGEN BONDED FERROELECTRICS

A.Gordon first studied solitonic coductivity in some hydrogen-bonded ferroelectric materials,using the hydrogen bonded chain model with asymmetric double-well potential,and gave the kink solution and expression for its mobility.However,kink solitons making contribution to proton-solitonic conductivity should be the solitons corresponding to proton transfer between two wells.For this reason,we suggest revising Gordon's result,giving a low-energy-state kink solution and a new expression for its mobility.With the asymmertic double-well potential transforming to the symmetric one,this expression is reduced exactly to the same form as previous research result.This expression shows that the phase-transision critical index is 1.