Ground-state properties and phonon dispersion curves of a classical linear-chain model
describing a crystal with an incommensurate phase are studied. This model is the DIFFOUR …

The structure of the fourfold modulated phase of betaine calcium chloride dihydrate has
been determined at 90 K. The refinement was performed using two different approaches: a …

Inelastic neutron scattering on deuterated BCCD revealed a transverse acoustic branch of Λ
3 symmetry coupled to a soft polarisation branch Py (k) of same symmetry. As the transition …

The modulation wave vector q= δ (T) c* of deuterated betaine calcium chloride dihydrate (D-
BCCD) was measured as a function of the temperature for certain dc electric fields, using …

The incommensurate structure of BCCD at 130 K with q= 0.296 c* has been determined in
the superspace-group P (Pnma):(1, s,− 1) by means of single crystal X-ray diffraction data …

Betaine calcium chloride dihydrate exhibits a sequence of over eleven structurally
modulated phases, as well as a reentrant incommensurate phase. This work shows that a …

A symmetry-based model for betaine calcium chloride dihydrate (BCCD) is presented.
BCCD is a crystal with many modulated phases that can be commensurate or …

An elastic-neutron-scattering study of partially deuterated dihydrate betaine calcium chloride
(D-BCCD) is reported. We obtain direct diffraction evidence for the occurrence of a …

A review of the presently available experimental information on the modulated phases of
BCCD, which display a devil's-staircase behavior, is given. Some basic experimental results …

We construct a symmetry-based, competing-interaction model for the phase-transition
sequence in betaine calcium chloride dihydrate (BCCD). Our model qualitatively reproduces …