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Title: Slow Processes in Supercooled o-Terphenyl: Relaxation and Decoupling
Authors: Saito, Makina  kyouindb  KAKEN_id
Kitao, Shinji  kyouindb  KAKEN_id
Kobayashi, Yasuhiro  kyouindb  KAKEN_id
Kurokuzu, Masayuki
Yoda, Yoshitaka
Seto, Makoto  kyouindb  KAKEN_id
Author's alias: 瀬戸, 誠
Issue Date: 14-Sep-2012
Publisher: American Physical Society
Journal title: Physical Review Letters
Volume: 109
Issue: 11
Thesis number: 115705
Abstract: We mapped the relaxation times of inter- and intramolecular correlations in o-terphenyl by a quasielastic scattering method using nuclear resonant scattering of synchrotron radiation. From the obtained map, we found that the slow β process is decoupled from the α process at 278 K, and this temperature is clearly below the previous decoupling temperature of 290 K, at which the α-relaxation dynamics changes. Then, it was also concluded that sufficient solidlike condition achieved by further cooling from 290 K is required to decouple the slow β process from the α process and, due to the difference of the length scales between the α and the slow β processes, these two averaged relaxation times <γ> are concluded not to cross as an extrapolation assumed so far. Furthermore, evidence of the restricted dynamics of the slow β process could be obtained as an anomalous momentum transfer (q) dependence of <γ>(<γ> ∝ q-2.9) at 265 K, observed at q values of 18–48 nm-1.
Description: 過冷却液体中のミクロなスケールでの固体的振る舞いの観測に成功 -液体状態の基礎理解とガラス転移の解明に期待-. 京都大学プレスリリース. 2012-09-15.
Rights: © 2012 American Physical Society
DOI(Published Version): 10.1103/PhysRevLett.109.115705
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