Landau theory of the RII-RI-RV rotator phases of alkanes

Prabir K. Mukherjee, Moshe Deutsch

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


A simple Landau theory is presented to describe the RII-RI-RV rotator phase sequence, with special emphasis on the RI-RV transition. The variation of the order parameters D, the lattice distortion, and θ, the molecular tilt angle, across the phases and transitions is determined and found to be in very good agreement with published experimental results. The pressure dependence of the RI-RV transition is also explored. The transition is found to be weakly first order, but can possibly become second order at elevated pressures. The coupling of the order parameters is shown to have a crucial influence on the phase behavior and order of the transition.

Original languageEnglish
Pages (from-to)3154-3162
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
StatePublished - 1999


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