摘要
The phase transition for La_(2)CuO_(4) changing from I4/mmm to Cmca with cell-doubling has been analysed within the frame work of Landau's theory.It is a second order transition via softening of the optical breathing mode,coupling with a slight lattice distortion arising from the softening elastic mode based on electron-phonon interaction.
作者
ZHANG Min
TAO Ruibao
ZHOU Shixun
张珉;陶瑞宝;周世勋(Department of Physics,Fudan University,Shanghai;Center of Theoretical Physics,CCAST World Laboratory,Beijing and Department of Physics,Fudan University,Shanghai)
基金
Project supported by National Science Foundation of China(Grant No.85127).
