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ZhETF, Vol. 122,
No. 4,
p. 840 (October 2002)
(English translation - JETP,
Vol. 95, No. 4,
p. 728,
October 2002
available online at www.springer.com
)
TEMPERATURE- AND FIELD-INDUCED TRANSITIONS IN FREE-STANDING FILMS OF AN ANTIFERROELECTRIC LIQUID CRYSTAL
Dolganov P.V., Demikhov E.I., Yoshiichi Suzuki, Atsuo Fukuda
Received: May 17, 2002
PACS: 61.30.Eb, 64.70.Md, 68.10.Cr
Thin free-standing films of a compound with the smectic-CA* and smectic-Cα* phases were investigated by means of depolarized microscopy and optical reflectivity. In thin films, the smectic phase sequence CA*-Cα*-A is replaced by a series of temperature- and field-induced transitions into states with the coplanar orientation of molecular tilt planes. Transitions are accompanied by a change of the direction of the electric polarization with respect to the tilt plane of molecules. The coplanar structure of these states is consistent with the Ising model.
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