Bibliographic Details
| Title: |
Experimental evidence for the ω4 tail of the nonphononic spectra of glasses. |
| Authors: |
Moriel, Avraham1 (AUTHOR), Lerner, Edan2 (AUTHOR), Bouchbinder, Eran3 (AUTHOR) eran.bouchbinder@weizmann.ac.il |
| Source: |
Journal of Applied Physics. 12/14/2024, Vol. 136 Issue 22, p1-7. 7p. |
| Subject Terms: |
*VIBRATIONAL spectra, *DENSITY of states, *PHONONS, *COMPUTERS |
| Abstract: |
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). [ABSTRACT FROM AUTHOR] |
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| Database: |
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