TY - JOUR
T1 - Influence of pressure on the boson peak
T2 - Stronger than elastic medium transformation
AU - Niss, K.
AU - Begen, B.
AU - Frick, B.
AU - Ollivier, J.
AU - Beraud, A.
AU - Sokolov, A.
AU - Novikov, V. N.
AU - Alba-Simionesco, C.
PY - 2007/8/3
Y1 - 2007/8/3
N2 - We study the changes in the low-frequency vibrational dynamics of poly(isobutylene) under pressure up to 1.4 GPa, corresponding to a density change of 20%. Combining inelastic neutron, x-ray, and Brillouin light scattering, we analyze the variations in the boson peak, transverse and longitudinal sound velocities, and the Debye level under pressure. We find that the boson peak variation under pressure cannot be explained by the elastic continuum transformation only. Surprisingly, the shape of the boson peak remains unchanged even at such high compression.
AB - We study the changes in the low-frequency vibrational dynamics of poly(isobutylene) under pressure up to 1.4 GPa, corresponding to a density change of 20%. Combining inelastic neutron, x-ray, and Brillouin light scattering, we analyze the variations in the boson peak, transverse and longitudinal sound velocities, and the Debye level under pressure. We find that the boson peak variation under pressure cannot be explained by the elastic continuum transformation only. Surprisingly, the shape of the boson peak remains unchanged even at such high compression.
UR - http://www.scopus.com/inward/record.url?scp=34547672715&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.99.055502
DO - 10.1103/PhysRevLett.99.055502
M3 - Article
AN - SCOPUS:34547672715
SN - 0031-9007
VL - 99
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 055502
ER -