Landau free energy form at the F point of the R3c structure
نویسندگان
چکیده
A free energy form compatible with the F point of the trigonal D~d(R 3c) symmetry is constructed. It is a function of the order parameter. elastic strain. and the stress. The resulting free energy exhibits a close formalistic analogy to the stressed cubic perovskite structures and their associated multicriticality.
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