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Titolo: METASTABILITY IN FLUCTUATIONDRIVEN FIRSTORDER TRANSITIONS  NUCLEATION OF LAMELLAR PHASES
Autore: HOHENBERG PC; SWIFT JB;
 Indirizzi:
 YALE UNIV,DEPT PHYS,POB 208120 NEW HAVEN CT 06520 AT&T BELL LABS MURRAY HILL NJ 07974 UNIV TEXAS,CTR NONLINEAR DYNAM AUSTIN TX 78712 UNIV TEXAS,DEPT PHYS AUSTIN TX 78712
 Titolo Testata:
 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
fascicolo: 2,
volume: 52,
anno: 1995,
pagine: 1828  1845
 SICI:
 1063651X(1995)52:2<1828:MIFFT>2.0.ZU;23
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 C MULTICRITICAL POINT; SMECTICA; MICROPHASE SEPARATION; 1STORDER TRANSITION; NOISE; ONSET;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Science Citation Index Expanded
 Citazioni:
 33
 Recensione:
 Indirizzi per estratti:



 Citazione:
 P.C. Hohenberg e J.B. Swift, "METASTABILITY IN FLUCTUATIONDRIVEN FIRSTORDER TRANSITIONS  NUCLEATION OF LAMELLAR PHASES", Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 52(2), 1995, pp. 18281845
Abstract
The nucleation of a lamellar phase from a supercooled homogeneous phase in a fluctuationdriven firstorder transition is studied, based ona phenomenological free energy due to Brazovskii (Zh. Eksp. Teor. Fit. 68, 175 (1975) [Sov. Phys. JETP 41, 85 (1975)]). The absence of phase coexistence in the corresponding meanfield approximation makes application of the standard droplet theory of homogeneous nucleation problematic. A selfconsistent coarsegraining procedure is introduced to overcome this difficulty, and the barrier height for nucleation of a critical droplet is estimated in the weakcoupling limit. Contrary to earlier estimates, the critical droplet shape is shown to be anisotropicin general. Some effects of distortions and defects in the lamellar structure are considered and are shown to affect the critical droplet only very near coexistence, where the probability of nucleation vanishes. The coarsegraining procedure introduced here follows from a novel application of the momentumshell renormalizationgroup method to systems in the Brazovskii class. Possible applications of the theory to the microphase separation transition in diblock copolymers and to RayleighBenard convection are briefly discussed.
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Documento generato il 21/09/20 alle ore 19:16:08