Abstract
Scanning tunnelling spectroscopy (STS) and microscopy (STM)were performed on the paramagnetic molecular superconductorβ′′-ET4[(H3O)Fe(C2O4)3]·C6H5Br. Under ambient pressure, this compound is located near the boundary separating superconductingand insulating phases of the phase diagram. In spite of a strongly reduced critical temperatureTc (Tc = 4.0 K at the onset,zero resistance at Tc = 0.5 K), the low temperature STS spectra taken in the superconducting regions show strong similarities with thehigher Tc ET κ-derivatives series. We exploited different models for the density of states (DOS), withconventional and unconventional order parameters to take into account the roleplayed by possible magnetic and non-magnetic disorder in the superconductingorder parameter. The values of the superconducting order parameter obtained bythe fitting procedure are close to the ones obtained on more metallic and higherTc organic crystals and far above the BCS values, suggesting an intrinsic role of disorder in thesuperconductivity of organic superconductors and a further confirmation of thenon-conventional superconductivity in such compounds.
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