Physics – Condensed Matter – Materials Science
Scientific paper
2008-09-16
J. Phys. Soc. Jpn 77(2008)094604
Physics
Condensed Matter
Materials Science
16 pages, 14 figures
Scientific paper
10.1143/JPSJ.77.094604
We study a Ginzburg-Landau model of structural phase transition in two dimensions, in which a single order parameter is coupled to the tetragonal and dilational strains. Such elastic coupling terms in the free energy much affect the phase transition behavior particularly near the tricriticality. A characteristic feature is appearance of intermediate states, where the ordered and disordered regions coexist on mesoscopic scales in nearly steady states in a temperature window. The window width increases with increasing the strength of the dilational coupling. It arises from freezing of phase ordering in inhomogeneous strains. No impurity mechanism is involved. We present a simple theory of the intermediate states to produce phase diagrams consistent with simulation results.
Minami Akihiko
Onuki Akira
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