Hi, Li Yan. This is a good question which, I am sure, has been addressed many times in many places. There are for sure a number of textbook references. The only one that occurs to me by heart is unfortunately in French [N. Boccara, Symmetries brisees (Hermann, Paris, 1976)]. Any textbook dealing with Landau's theory of phase transitions would do. The literature in the field looks often more complicated than it actually should. You may want to take a glance at a pair of old papers of mine where your issue is addressed using minimum theoretical background.
NARDELLI MB, BARONI S, GIANNOZZI P HIGH-PRESSURE LOW-SYMMETRY PHASES OF CESIUM-HALIDES PHYSICAL REVIEW B 51 (13): 8060-8068 APR 1 1995 NARDELLI MB, BARONI S, GIANNOZZI P PHONON SOFTENING AND HIGH-PRESSURE LOW-SYMMETRY PHASES OF CESIUM IODIDE PHYSICAL REVIEW LETTERS 69 (7): 1069-1072 AUG 17 1992 Hope you will find something useful in them. If not, I will try to write a short explanation, but for this you will have to wait for me to find 1-2 hours of spare time, which is not going to be tomorrow ... Cheers - Stefano On Jan 9, 2007, at 8:54 AM, li yan wrote: > Dear all, > Since the displacive phase transition is second order, why > some first order transitions are considered to be induced by the > displacive instabilities? would you please give me some advices or > some reference papers about this? > > best regards > __________________________________________________ > ??????????????? > http://cn.mail.yahoo.com --- Stefano Baroni - SISSA & DEMOCRITOS National Simulation Center - Trieste [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype) Please, if possible, don't send me MS Word or PowerPoint attachments Why? See: http://www.gnu.org/philosophy/no-word-attachments.html -------------- next part -------------- An HTML attachment was scrubbed... URL: /pipermail/attachments/20070110/38841172/attachment.htm
