TY - JOUR
T1 - Experimental evidence for the ω4 tail of the nonphononic spectra of glasses
AU - Moriel, Avraham
AU - Lerner, Edan
AU - Bouchbinder, Eran
N1 - Publisher Copyright: © 2024 Author(s).
PY - 2024/12/14
Y1 - 2024/12/14
N2 - It is now established that glasses feature low-frequency, nonphononic excitations, in addition to phonons that follow Debye’s vibrational density of state (VDoS). Extensive computer studies demonstrated that these nonphononic, glassy excitations follow a universal non-Debye VDoS D G ( ω ) ∼ ω 4 at low frequencies ω . Yet, due to intrinsic difficulties in disentangling D G ( ω ) from the total VDoS D ( ω ) , which is experimentally accessible through various scattering techniques, the ω 4 tail of D G ( ω ) lacked direct experimental support. We develop a procedure to extract D G ( ω ) from the measured D ( ω ) , based on recent advances in understanding low-frequency excitations in glasses, and apply it to available datasets for diverse glasses. The resulting analysis indicates that the ω 4 tail of the nonphononic vibrational spectra of glasses is nontrivially consistent with a broad range of experimental observations. It also further supports that D G ( ω ) makes an additive contribution to D ( ω ) .
AB - It is now established that glasses feature low-frequency, nonphononic excitations, in addition to phonons that follow Debye’s vibrational density of state (VDoS). Extensive computer studies demonstrated that these nonphononic, glassy excitations follow a universal non-Debye VDoS D G ( ω ) ∼ ω 4 at low frequencies ω . Yet, due to intrinsic difficulties in disentangling D G ( ω ) from the total VDoS D ( ω ) , which is experimentally accessible through various scattering techniques, the ω 4 tail of D G ( ω ) lacked direct experimental support. We develop a procedure to extract D G ( ω ) from the measured D ( ω ) , based on recent advances in understanding low-frequency excitations in glasses, and apply it to available datasets for diverse glasses. The resulting analysis indicates that the ω 4 tail of the nonphononic vibrational spectra of glasses is nontrivially consistent with a broad range of experimental observations. It also further supports that D G ( ω ) makes an additive contribution to D ( ω ) .
UR - http://www.scopus.com/inward/record.url?scp=85211967055&partnerID=8YFLogxK
U2 - https://doi.org/10.1063/5.0246261
DO - https://doi.org/10.1063/5.0246261
M3 - مقالة
SN - 0021-8979
VL - 136
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 22
M1 - 225105
ER -