Abstract
Polycrystalline material of the α-phase of (BEDT-TTF)2I3 was compressed to small samples (4 mm × 1 mm, thickness 0.3 mm typically) at a pressure of 10 kbar. Annealing at 70°C yields the superconducting αt-phase.Microwaves (10.2 GHz) enable the measurements of the conductivity for stepwise annealing after every annealing step in always the same sample. For annealing times ⪆ 10 min all conductivity versus temperature curves are intersecting in an isosbestic point at 190 K. This behaviour can be described by a conductivity relation for a two component system, from which was determined the volume fraction of the new grown αt-phase in dependence of the annealing time.Starting annealing (annealing times < 10 min) shows another unexpected phase transformation. After 2 min annealing the conductivity at 200 K increases by more than one order of magnitude, but then decreases of further annealing (5–10 min) down to the value for the unannealed sample.
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