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Linear thermal expansion coefficient (LTEC) of single crystalk-(D4-BEDT-TTF)2Cu[N(CN)2]Br was studied across the crystal layers in thetemperature range 2-290 K using the method of precise capacitive dilatometry.Below Tc = 11,6 K the LTEC of the sample had a small negative value, which isapparently due to the transition from the paramagnetic metal in thesuperconducting state. There was a bend of temperature dependence of the LTEC,which shows broad peak around 40 K and can be attributed to the elastic latticeanomaly around the end-point of Mott boundary. A sharp jump in the LTEC valuesand hysteresis was observed in the area of Tg ~ 75-77 K, what is likelyexplained by the transition in a glass-like state. The isotope effect in thethermal expansion is discusses, which manifested itself in a shift of the phasetransitions in comparison with fully deuterated BEDT-TTF sample.

Thermal expansion of organic superconductor k-(D4-BEDT-TTF)2Cu{N(CN)2}Br. Isotopic effect