Integrated x-ray-scattering intensity measurement of the order parameter at the nematic-to-smectic-Aphase transition
نویسندگان
چکیده
منابع مشابه
The Measurement of the Nematic Order Parameter by X-ray Scattering Reconsidered
This paper reviews and extends the procedure used to measure the nematic order parameter by X-ray scattering. We show that the well-known integral equation derived by Leadbetter and coworkers, relating the scattered intensity 1(0) to the orientational distribution
متن کاملLight scattering from the free surface near a second order nematic to smectic a phase transition
2014 We have studied the spectrum of light scattered by surfaces waves thermally excited on the free surface of a nematic liquid crystal in a magnetic field near a second order nematic to smectic A phase transition. We have measured the surface tension and three viscosity coefficients. One of the viscosities diverges and its critical behaviour has been followed to within 3 mK of the transition....
متن کاملNematic Order near a Tricritical Nematic - Smectic a Phase Transition
The nematic to smectic A (NA) phase transition in liquid crystals has been a subject of extensive study in recent years. The original theories due to McMillan [ I] and de Gennes [ 21 suggested that this transition could be first or second order. De Gennes, using a Landau expansion of the smectic free energy, emphasized the coupling between the smectic or density order parameter, v and the nemat...
متن کاملEffect of mosaicity in x-ray studies of critical behavior at the nematic to smectic-A transition.
Previous studies of critical behavior at the nematic to smectic-A transition by high-resolution x-ray scattering were performed using low magnetic fields of 0.1-0.8 T. In those studies, the transverse resolution was limited by the sample mosaicity which complicated data analysis. In order to understand the effect of sample mosaicity on the measured values of critical exponents, the divergence o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1985
ISSN: 0031-9007
DOI: 10.1103/physrevlett.54.920