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[Philippe Ghosez <Philippe.Ghosez@ulg.ac.be>]

> Hello all abinit users and good year:
> I want to know more on soft modes of vibrations (courses, 
> publications..), can't anyone  help me and send some references 
> related to this subjects
>
> thank you very much.

Hello,

Some informations on the origin of unstable modes and structural 
instabilities in ferroelectric compounds are available in lecture 
notes accessible at the following address:

http://www.ulg.ac.be/phythema/Head/publi.htm

Look for the course :
"Microscopic Properties of Ferroelectric Oxides
from First Principles: Selected Topics"
( file :  Lecture_Ferro-1-May02.ps.gz )

There are some informations in the Chapter on
the lattice dynamics.

Best wishes,

Philippe GHOSEZ.


----------------------------------
Philippe GHOSEZ
Universite de Liege
Institut de Physique, Bat. B5
Allee du 6 aout, 17
B- 4000 Sart Tilman
BELGIUM

Phone : ++(32) (0)4-366.36.11
Fax   : ++(32) (0)4-366.29.90
E-mail: Philippe.Ghosez@ulg.ac.be

http://www.ulg.ac.be/phythema
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