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- W2014520301 abstract "Binary mixtures of two compounds with phase sequences isotropic (I)--chiral-nematic (N)--chiral-smectic-C (${mathit{C}}^{mathrm{*}}$) and I--N--smectic-A (A)--${mathit{C}}^{mathrm{*}}$ have been investigated. Spontaneous-polarization and tilt-angle measurements near the A-${mathit{C}}^{mathrm{*}}$ transition indicate a mean-field-like to tricritical crossover behavior near the N-A-${mathit{C}}^{mathrm{*}}$ point of the phase diagram, the critical exponent ensuremath{beta} varying continuously from values near 0.5 to almost 0.25. The heat capacity has also been measured with a high-resolution ac calorimetric technique at the A-${mathit{C}}^{mathrm{*}}$ and N-A transitions of three mixtures. It is found that the A-${mathit{C}}^{mathrm{*}}$ transition is well described by an extended mean-field model. The fits show that, in accordance with polarization and tilt-angle measurements, the transition evolves from a second-order regime towards tricriticality as the A range decreases. Based on these results and other analogous studies published by other authors, some considerations about the material requirements necessary to obtain first-order A-${mathit{C}}^{mathrm{*}}$ transitions are briefly discussed." @default.
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- W2014520301 date "1993-09-01" @default.
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- W2014520301 title "Character of the smectic-<i>A</i>–chiral-smectic-<i>C</i>phase transition near a chiral-nematic–smectic-<i>A</i>–chiral-smectic-<i>C</i>point" @default.
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- W2014520301 doi "https://doi.org/10.1103/physreve.48.1970" @default.
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