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
F Delahaye et al 2000 Metrologia 37 659
J L Gardner and R B Frenkel 1999 Metrologia 36 477
E Bonetti et al 1991 Supercond. Sci. Technol. 4 S196
C Barber 1981 Clin. Phys. Physiol. Meas. 2 135
S Dorbolo et al 2003 New J. Phys. 5 161
R S Davis 1992 Metrologia 29 67
Ken Dobson 1998 Phys. Educ. 33 75
Bo Lindell 2000 J. Radiol. Prot. 20 1
R Bennewitz et al 2002 Nanotechnology 13 499