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The temperature dependence of the linear thermal expansion coefficients(LTEC) of a single crystal of a-(BEDT-TTF)2NH4Hg(SCN)4 where BEDT-TTF isbis(ethylenedithio)tetrathiafulvalene was studied by the method of precisioncapacitive dilatometry in the temperature range 2-250 K along thecrystallographic direction b* (perpendicular to the crystal layers). Negativevalues of LTEC were found below 4 K. Probably it is due to charge fluctuationsas the temperature approaches the temperature of transition to thesuperconducting state Tc. It has been suggested that the bends on temperaturedependence of LTEC observed in the temperature range 25-45 K are related toorder-disorder arrangement of NH4+ ions. Weak maximum of the LTEC, detected ata temperature of about 200-220 K, can be caused by the processes of chargeredistribution and the associated intermolecular interaction fluctuations.

Thermal expansion of organic superconductor a-(BEDT-TTF)2 NH4Hg(SCN)4