Dielectric measurements on chiral smectic C liquid crystals

Parmar, D. S.; Martinot-Lagarde, Ph.

doi:10.1051/anphys/197803030275

Cited by 29 publications

(8 citation statements)

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“…[5], where one does not find equal amplitudes for the Goldstone and the soft mode contributions at 7e. On the other hand, our expression explains correctly the widely observed [8,9,10] temperature variation of As in the C* phase, by just the temperature dependence of the predominant Goldstone mode (through q(T)).…”

Section: K33 -Xl~2supporting

confidence: 81%

Flexoelectric effects in ferroelectric liquid crystals ?

Martinot-Lagarde

Durand

1980

J. Phyique Lett.

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2014 Nous montrons que la contribution flexoélectrique à la polarisation spontanée électrique des cristaux liquides smectique C* ne joue aucun rôle dans la constante diélectrique de la phase ferroélectrique. Les experiences récentes qui concluaient à une forte contribution flexoélectrique à partir de l'analyse de la constante diélectrique doivent être réinterprétées. Abstract. 2014 We show that the flexoelectric part of the spontaneous polarization in chiral smectic C* liquid crystal does not contribute at all to the static dielectric constant in the ferroelectric phase. Recent experimental data which concluded to a large flexoelectric contribution from dielectric constant analysis must be reinterpreted.

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Section: K33 -Xl~2supporting

confidence: 81%

Flexoelectric effects in ferroelectric liquid crystals ?

Martinot-Lagarde

Durand

1980

J. Phyique Lett.

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“…Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and references cited therein). In addition there have been studies on defects [21][22][23][24] and on the phase transition behaviour near a tricritical point (SmA-SmC-SmC*) in a magnetic field [25].…”

Section: Phy77-27084mentioning

confidence: 99%

Macroscopic dynamics of chiral smectic C

Brand

Pleiner

1984

J. Phys. France

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2014 Nous présentons les équations hydrodynamiques qui gouvernent les propriétés macroscopiques des smectiques C chiraux. La dérivation de ces équations tient compte de la nature des symétries brisées dont les conséquences hydrodynamiques sont mises en évidence. Nous examinons en détail les similitudes et les différences entre le cas présent et celui des smectiques C non chiraux et des cristaux liquides cholestériques. Nous discutons l'influence et les conséquences de la ferroélectricité sur l'hydrodynamique et, en particulier, sur la structure des excitations hydrodynamiques. Abstract. 2014 The hydrodynamic equations describing the macroscopic behaviour of chiral smectic C are presented. To derive these equations the nature of the spontaneously broken continuous symmetries is considered and their consequences for the hydrodynamics are pointed out. Similarities and differences to achiral smectic C and cholesteric liquid crystals are investigated in some detail. The influence and the consequences of ferroelectricity on the hydrodynamics, in particular on the structure of the normal modes, is discussed. In two appendices we study flexoelectric and electrohydrodynamic effects for various other liquid crystalline phases.

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“…These systems are interesting from the view point of their physical properties [2-41 and use in display devices due to their fast switching speeds [5- Dielectric properties of ferroelectric liquid crystals (FLCs) hold a special interest in understanding the influence of the helicoidal texture on the static and dynamic properties of these systems. The earlier dielectric studies in FLCs were carried out in classic schiff base compounds [8]. Levstik et al [9] explained experimentally and theoretically the presence of two relaxation modes "Goldstone mode" (GM) and "Soft mode" (SM) in these liquid crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Relaxations in a Short Pitch Ferroelectric Liquid Crystal

Raina

Ahuja

1998

Molecular Crystals and Liquid Crystals Science and Technology.

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Dielectric measurements in the frequency range 100 Hz to 100 kHz have been carried out in a short pitch ferroelectric liquid crystal mixture FLC-6430 (Hoffmann -La-Roche) in the SmC* phase aligned in planar orientation. The effects of temperature, frequency and bias voltage on the dielectric properties of this material have been investigated. The relaxation frequency fr, distribution parameter CI and the dielectric strength E, have been determined. The calculated values were found to be -0.59kHz. 0.134 and 427.77 respectively forfr, a and E, at 45°C. A constant DC bias of 0.13 V/pm applied to the sample partially suppresses the Goldstone mode.

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Dielectric measurements on chiral smectic C liquid crystals

Cited by 29 publications

References 0 publications

Flexoelectric effects in ferroelectric liquid crystals ?

Flexoelectric effects in ferroelectric liquid crystals ?

Macroscopic dynamics of chiral smectic C

Dielectric Relaxations in a Short Pitch Ferroelectric Liquid Crystal

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