A Girard et al 1987 J. Phys. C: Solid State Phys. 20 601 doi:10.1088/0022-3719/20/4/010
A Girard, Y Delugeard and C Ecolivet
Show affiliationsThe authors report further Raman measurements of the chloranil soft mode. An iodine cell has been set in the scattered beam to improve the results of their previous study. They have been able to show a mean-field behaviour up to Tc-1 K. At this temperature the soft-mode frequency is equal to 1.6 cm-1. Therefore, chloranil is an excellent example of a substance that undergoes a displacive structural phase transition. At temperatures closer to Tc this mode becomes overdamped and its response function can be likened to a relaxational function. The corresponding relaxation time appears to be about 4*10-11 s.
78.30.Jw Organic compounds, polymers
63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions
Soft matter, liquids and polymers
Issue 4 (10 February 1987)
A Girard et al 1987 J. Phys. C: Solid State Phys. 20 601
K T Park et al 1987 J. Phys. C: Solid State Phys. 20 1241
I D Vagner 1982 J. Phys. C: Solid State Phys. 15 4033
A Yanase and A Hasegawa 1980 J. Phys. C: Solid State Phys. 13 1989
G S Dubey et al 1979 J. Phys. C: Solid State Phys. 12 L103
P W Tasker 1979 J. Phys. C: Solid State Phys. 12 4977
G P Gupta et al 1979 J. Phys. C: Solid State Phys. 12 2411
J J Forney et al 1977 J. Phys. C: Solid State Phys. 10 1887
A J Thakkar and V H Smith Jr 1974 J. Phys. B: At. Mol. Phys. 7 L321
J H Whealton 1974 J. Phys. B: At. Mol. Phys. 7 1602