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Surface effects in field-induced smectic transitions

  • P. Galatola
  • M. Zelazna
  • I. Lelidis
Article

Abstract:

We study the surface behavior of a semi-infinite smectogenic sample bounded by a solid wall, in the presence of an external electric field. Our analysis is performed in the framework of a Landau-de Gennes theory. For the sake of simplicity, we consider only the case in which, in the absence of field and surfaces, a direct isotropic to smectic-A transition occurs, while in the presence of the electric field a nonspontaneous nematic phase appears. Two new surface phases are identified, namely a parasmectic and a surface-induced smectic phase. The shifts in the transition temperatures and the critical behavior of the surface states are analyzed.

PACS. 64.70.Md Transition in liquid crystals - 68.35.Md Surface energy; thermodynamics properties - 64.10.+h General theory of equations of state and phase equilibria 

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Copyright information

© EDP Sciences, Springer-Verlag 1998

Authors and Affiliations

  • P. Galatola
    • 1
  • M. Zelazna
    • 1
  • I. Lelidis
    • 2
  1. 1.Dipartimento di Fisica and Istituto Nazionale di Fisica della MateriaPolitecnico di TorinoTorinoItaly
  2. 2.Département de PhysiqueInstitut de Génie Atomique, École Polytechnique Fédérale de LausanneLausanneSwitzerland

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