Tunnelling spectra in (TMTSF)2ClO4/I/Pb junctions

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Abstract
By using the tunnelling effect, we can observe all density variations around the Fermi level of the junction electrodes. Nevertheless, zero bias anomalies may induce ambiguous interpretations. With the aim to getting rid of all ambiguity, we have realized (TMTSF) 2ClO4/I/Pb devices, the lead serving as a quality test. In the best junctions, a particular effect is observed when the temperature decreases, for temperatures T above the Tc of (TMTSF)2ClO4. This effect might be due to the occurrence of 1-D fluctuating superconductivity domains. But we cannot be sure that there is no zero bias anomaly. Our future work (observation of the tunnelling curve when the temperature varies from T > Tc of (TMTSF)2ClO4 to T < Tc) should allow us to see if the observed effect described in this paper is actually due to the organic conductor