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- W2014124748 abstract "The molecular solid bis(4-chlorophenyl)sulfone (BClPS) is one of the few van der Waals crystals having a displacive, soft-mode driven, incommensurate (IC) phase transition. In this work, we present an experimental study of the structural and dynamical behavior at low temperatures of three molecular solids closely related to BClPS: phenylsulfone, perdeuterated bis(4-bromophenyl)sulfone $(densuremath{-}mathrm{BBrPS}),$ and a mixed crystal $densuremath{-}mathrm{B}mathrm{B}mathrm{r}mathrm{P}mathrm{S}/mathrm{B}mathrm{C}mathrm{l}mathrm{P}mathrm{S}$ with a molar ratio $[densuremath{-}mathrm{B}mathrm{B}mathrm{r}mathrm{P}mathrm{S}/mathrm{B}mathrm{C}mathrm{l}mathrm{P}mathrm{S}]=0.15.$ Measurements of ${}^{2}mathrm{H}$ nuclear-magnetic-resonance relaxation times in $densuremath{-}mathrm{BBrPS}$ as a function of temperature showed the onset of a dynamical process between 157 and 148 K, similar to that observed in the phase transition of BClPS at 148 K. The temperature evolution of the relaxation rate is described in terms of the spectral density associated with a soft phonon with central-peak effects, using identical dynamical parameters measured for BClPS by neutron scattering. Neither loss of spatial periodicity nor symmetry change were detected in $densuremath{-}mathrm{BBrPS}$ below 148 K. For the mixed crystal, an IC phase was detected at low temperature, similar to that of BClPS but with spatial distortions of smaller amplitude." @default.
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- W2014124748 date "2001-08-02" @default.
- W2014124748 modified "2023-10-18" @default.
- W2014124748 title "Structural instabilities in bis(4-chlorophenyl)sulfone derivatives studied by Raman spectroscopy and deuteron NMR" @default.
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- W2014124748 doi "https://doi.org/10.1103/physrevb.64.094103" @default.
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