Dynamical signature of two ''ideal glass transitions'' in nematic liquid crystals

A temperature scaling analysis using the same mode coupling theory (MCT) scaling relationships employed for supercooled liquids is applied to optical heterodyne detected optical Kerr effect data for four liquid crystals. The data cover a range of times from ∼1 ps to 100 ns and a range of temperatures from ∼50 K above the isotropic to nematic phase transition temperature TNI down to ∼TNI. The slowest exponential component of the data obeys the Landau–de Gennes (LdG) theory for the isotropic phase of liquid crystals. However, it is also found that the liquid crystal data obey MCT scaling relationships, but, instead of a single scaling temperature TC as found for supercooled liquids, in the liquid crystals there are two scaling temperatures TCL (L for low temperature) and TCH (H for high temperature). TCH is very close to T*, which results from LdG scaling, just below the isotropic to nematic phase transition temperature, TNI, but is 30–50 K higher than TCL. The liquid crystal time dependent data have the id...

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