In this work we examine layer fluctuations in a smectic elastomer with quenched random disorder induced by crosslinks. The system is analyzed in a continuum model and crosslinks are introduced as a random field in a macroscopic picture. In the case of small deformations and replica symmetry the intensity profile for x-ray scattering along the layer normal was determined for layer displacements smaller than the layer separation. In this regime it is predicted that for large enough crosslink densities the first-order diffraction pattern of the solid assumes a characteristic squared-Lorentzian form, showing a decay of short-range order over a length scale of 20 nm. Crosslinks are observed to disorder the system by decreasing the correlation length, which we show not to be a consequence of the random field. The coupling to random crosslinks is predicted to retard the decrease in the correlation length and hence found to stabilize the one-dimensional periodic layer structure against thermal fluctuations. The dependence of the correlation length on the crosslink density leads us to propose an estimate for the percolation limit of a smectic elastomer network.
We have extended our earlier study (Heard & Warwick 2013, Paper I) of the
X-ray emission emanating from the central 100 pc x 100 pc region of our Galaxy
To an investigation of several features prominent in the soft X-ray (2-4.5 keV)
Band. We focus on three specific structures: a putative bipolar out...
We investigate the thermoelastic response of a nanolayered sample composed of
A metallic SrRuO3 (SRO) electrode sandwiched between a ferroelectric
Pb(Zr0.2Ti0.8)O3 (PZT) film with negative thermal expansion and a SrTiO3
Substrate. SRO is rapidly heated by fs-laser pulses with 208 kHz repetition
We present Hubble Space Telescope optical and near-IR observations of the
Short-hard GRB 130603B (z=0.356) obtained 9.4 days post-burst. At the position
Of the burst we detect a red point source with m(F160W)=25.8+/-0.2 AB mag and
M(F606W)>27.5 AB mag (3-sigma), corresponding to rest-frame absolute...
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