1994/06/06 by M. A. Fradkin, Fradkin, M. A.
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Condensed Matter (cond-mat) #Crystal Structures and Properties #FOS: Physical sciences #High-pressure geophysics and materials #Solid-state spectroscopy and crystallography #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9406029
MAF-13.3/94 10 pages in REVTeX 3.0 format, 3 uuencoded *.eps figures appended
arxiv created 1994/06/06 · openalex publication_date 1994/06/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The effect of the external field on the weakly-discontinuous first-order phase transition is analyzed in the frame of the Landau theory. The transformation of the free energy expansion as a power series in the order parameter is suggested that maps the first-order phase transition onto the second-order one under the 'effective' external field, that depends on both temperature and on real field value. The presence of the third-degree term in the Ginzburg-Landau expansion is shown to preserve the weakly-discontinuous phase transition for some values of the external field in contrast with the second-order phase transition. The case of proper ferroelastic (martensitic) phase transition from cubic lattice to tetragonal one is considered and the dependence of the transition temperature on the external hydrostatic as well as uniaxial pressure is found.