Physics – Condensed Matter
Scientific paper
1998-03-20
J. Phys.: Condens. Matter 10, 6883 (1998)
Physics
Condensed Matter
14 pages, 9 figures, submitted to J. Phys. Condens. Matter
Scientific paper
10.1088/0953-8984/10/31/007
A Double Ising Spin model for uniaxially structurally modulated materials exhibits as a special feature phase transitions between phases with equal wave numbers but different pseudo spin configurations. The character of these `internal' transitions is investigated in mean field approximation, with the mean field transfer matrix method, and in Monte Carlo simulations. The structural changes at the transitions are characterized by different strengths of harmonics in a Fourier analysis of the spatial modulation. A dielectric anomaly in the phase diagram of betaine calcium chloride dihydrate (BCCD) and seemingly contradictory structure analyses are explained.
Neubert Boris
Pleimling Michel
Siems Rolf
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