Abstract
The quasi-2D ‘organic’ conductor α-(BEDT-TTF) 2I 3 undergoes a metal to insulator transition near 135 K. We have observed for the first time in the specific heat a sharp, hysteretic, first order phase transition associated with this metal-insulator transition. We find a lower bound on the entropy change ΔS of 94% (±20%) RIn2 per mole (2.4 mJ/g-K), corresponding to a lower bound for the latent heat of 0.32 J/g. Extrapolating from below and above the transition, we estimate the change in the specific heat ΔC at the transition to be ≈ 1.4 μJ/mole K (3.2 mJ/g-K). The observed behavior differs significantly from both Peierls type and large Coulomb repulsion Mott-Hubbard type metal-insulator transitions in quasi-1D organic conductors.
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