Slow processes in supercooled o-terphenyl: Relaxation and decoupling

Makina Saito, Shinji Kitao, Yasuhiro Kobayashi, Masayuki Kurokuzu, Yoshitaka Yoda, Makoto Seto

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35 Citations (Scopus)


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 τ 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 τ(τq -2.9) at 265 K, observed at q values of 18-48nm -1.

Original languageEnglish
Article number115705
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 2012 Sept 14


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