Abstract
$^{35}\mathrm{Cl}$ nuclear-magnetic-resonance (NMR) measurements were run at high d c magnetic fields in a temperature range close to the phase transition at ${T}_{i}\ensuremath{\approx}150\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ into the incommensurately (IC) modulated phase of bis(4-chlorophenyl)sulphone (BCPS). Line-shape calculations in the IC phase show the typical features with edge singularities and reveal that the frequency distribution is essentially of static nature. NMR spin-lattice relaxation times ${T}_{1}$ were measured at various $dc$ magnetic fields. The ${T}_{1}$ values at higher fields ($11.7\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ and $17.6\phantom{\rule{0.3em}{0ex}}\mathrm{T}$) do not show the anomalies as previously reported for the $^{35}\mathrm{Cl}$ nuclear quadrupole resonance spin-lattice relaxation times for BCPS in the temperature range [${T}_{i}$, ${\mathit{T}}_{i}\ensuremath{-}10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$]. The present $^{35}\mathrm{Cl}$ NMR studies unambiguously confirm that the general conception of amplitudon and phason modes is also applicable to the IC phase in BCPS crystals.
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