Abstract
High-resolution measurements of the linear coefficients of thermal expansion, α i (T), on κ-(ET) 2 Cu[N(CN) 2 ]Br reveal large, step-like anomalies at temperatures around 75 K. These have been identified as a kinetic, glass-like transition, where below a certain temperature Tg a characteristic disorder in the orientational degrees of freedom of the donor molecule's ethylene endgroups becomes frozen. The phenomenology of this relaxation process provides a natural explanation for the observed time and cooling-rate dependences of the ground-state properties in this system. Furthermore, the data suggest that the degree of disorder in the sample can be varied in a controlled way by controlling the cooling rate as well as the applied pressure.
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