TY - JOUR
T1 - On the role of quasi-localized soft-mode vibrations in the boson peak and quasi-elastic scattering in glasses
AU - Klinger, M. I.
AU - Halpern, V.
PY - 1999/6/14
Y1 - 1999/6/14
N2 - It is argued that the contribution of quasi-localized ID soft-mode vibrational excitations to the photon (neutron) quasi-elastic scattering (QES) correlated with the boson peak in glasses can be considerable, as well as the earlier revealed contribution of acoustic phonons is. The main points are that only anharmonic coupling of the 1D soft mode with acoustic modes can give rise to this kind of QES and, at least for direct cubic anharmonic coupling, the coupling coefficient in a glass is finite.
AB - It is argued that the contribution of quasi-localized ID soft-mode vibrational excitations to the photon (neutron) quasi-elastic scattering (QES) correlated with the boson peak in glasses can be considerable, as well as the earlier revealed contribution of acoustic phonons is. The main points are that only anharmonic coupling of the 1D soft mode with acoustic modes can give rise to this kind of QES and, at least for direct cubic anharmonic coupling, the coupling coefficient in a glass is finite.
UR - http://www.scopus.com/inward/record.url?scp=0347245549&partnerID=8YFLogxK
U2 - 10.1016/s0375-9601(99)00246-7
DO - 10.1016/s0375-9601(99)00246-7
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AN - SCOPUS:0347245549
SN - 0375-9601
VL - 256
SP - 379
EP - 385
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 5-6
ER -