Thermal and structural study close to a smecticA-smecticA critical point

Two previous works([1,2]) firstly evidenced the possible occurrence of gaps of miscibility in smectic A solutions of two non polymer mesogens and late r demonstrated the connection of this phenomenon with the difference in lav er spacing of the two pure components. In the present paper we provide a de tailed thermal and structural analysis of the phase separation around the s mecticA-smecticA consolute point of a selected system. It encompasses two h igh temperature resolution studies which give valuable information about th e universality class to which this critical point is likely to be attached.