抄録
Propagation characteristics of the 0th order symmetric (S_0) mode shear horizontal (SH) wave are described under the construction of a cell containing smectic liquid crystal, which are measured as a parameter of temperature. An abrupt loss change and a maximum phase delay are observed at the vicinity of N -SmA phase transition temperature. The measured propagation loss and phase delay are related to the viscosity and finite shear elasticity in the smectic A phase.