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- W2037206102 abstract "We have studied the molecular rotational motion about its long axis in ferroelectric chiral smectic-C (Sm-C) and antiferroelectric chiral smectic-${mathrm{C}}_{mathrm{a}}$ (Sm-${mathrm{C}}_{mathrm{A}}^{mathrm{*}>}$) liquid crystals and observed a few tens of picosecond relaxation time. Previously reported results using degenerate four-wave mixing with 25-ps pump pulses [Lalanne et al., Phys. Rev. A 44, 6632 (1991)] claimed to show a critical slowing down in the temperature region more than 0.1 ifmmode^circelsetextdegreefi{}C above the Sm-A--Sm-C phase transition. Our measurements of the optical Kerr effect with 130-fs pump pulses do not show any critical slowing down in the corresponding temperature region above the phase transition from Sm-A to Sm-C or Sm-${mathrm{C}}_{mathrm{A}}^{mathrm{*}>}$. The result may indicate that the laser-induced molecular reorientation with ensuremath{tau}ensuremath{sim}${10}^{mathrm{ensuremath{-}}11}$ s scarcely couples with the tilt angle and the polarization. A possibility has been discussed that a slower rotational motion with ensuremath{tau}ensuremath{gtrsim}${10}^{mathrm{ensuremath{-}}10}$ s plays a primary role for the emergence of ferroelectricity and/or antiferroelectricity." @default.
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- W2037206102 date "1997-02-01" @default.
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- W2037206102 title "Relaxation time of molecular rotation about its long axis in the smectic-A phase of ferroelectricand antiferroelectric liquid crystals as observed by picosecond optical Kerr effect" @default.
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- W2037206102 doi "https://doi.org/10.1103/physreve.55.1632" @default.
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