2001/05/15 by Hajime Tanaka · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Liquid Crystal Research Advancements #Material Dynamics and Properties #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.1143/jpsj.70.1178
published as published in J. Phys. Soc. Jpn. 70, 1178 (2001) · 5 pages, 1 figure, An error in the reference (Ref. 7) was corrected
openalex publication_date 2001/05/15 · arxiv created 2001/06/08 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We propose that the boson peak originates from the (quasi-) localized vibrational modes associated with long-lived locally favored structures, which are intrinsic to a liquid state and are randomly distributed in a sea of normal-liquid structures. This tells us that the number density of locally favored structures is an important physical factor determining the intensity of the boson peak. In our two-order-parameter model of the liquid-glass transition, the locally favored structures act as impurities disturbing crystallization and thus lead to vitrification. This naturally explains the dependence of the intensity of the boson peak on temperature, pressure, and fragility, and also the close correlation between the boson peak and the first sharp diffraction peak (or prepeak).