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Scanning tunnelling spectroscopy study of paramagnetic superconducting beta ''-ET4[(H3O)Fe(C2O4)(3)]center dot C6H5Br crystals (Articolo in rivista)

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Scanning tunnelling spectroscopy study of paramagnetic superconducting beta ''-ET4[(H3O)Fe(C2O4)(3)]center dot C6H5Br crystals (Articolo in rivista) (literal)

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Gambardella, A; Salluzzo, M; Di Capua, R; Affronte, M; Gimenez-Saiz, C; Gomez-Garcia, CJ; Coronado, E; Vaglio, R (2010)
Scanning tunnelling spectroscopy study of paramagnetic superconducting beta ''-ET4[(H3O)Fe(C2O4)(3)]center dot C6H5Br crystals
in Journal of physics. Condensed matter (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
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Gambardella, A; Salluzzo, M; Di Capua, R; Affronte, M; Gimenez-Saiz, C; Gomez-Garcia, CJ; Coronado, E; Vaglio, R (literal)

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1. CNR SPIN, I-80126 Naples, Italy 2. Univ Molise, Dipartimento SpeS, I-86100 Campobasso, Italy 3. Univ Modena & Reggio Emilia, CNR, Inst NanoSci S3, I-41125 Modena, Italy 4. Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena, Italy 5. Univ Valencia, Inst Ciencia Mol, Paterna Valencia 46980, Spain 6. Univ Naples Federico 2, Dipartimento Sci Fis, I-80126 Naples, Italy (literal)

Titolo

Scanning tunnelling spectroscopy study of paramagnetic superconducting beta ''-ET4[(H3O)Fe(C2O4)(3)]center dot C6H5Br crystals (literal)

Abstract

Scanning tunnelling spectroscopy (STS) and microscopy (STM) were performed on the paramagnetic molecular superconductor ???-ET4[(H3O)Fe(C2O4)3]·C6H5Br. Under ambient pressure, this compound is located near the boundary separating superconducting and insulating phases of the phase diagram. In spite of a strongly reduced critical temperature Tc (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 the higher Tc ET ?-derivatives series. We exploited different models for the density of states (DOS), with conventional and unconventional order parameters to take into account the role played by possible magnetic and non-magnetic disorder in the superconducting order parameter. The values of the superconducting order parameter obtained by the fitting procedure are close to the ones obtained on more metallic and higher Tc organic crystals and far above the BCS values, suggesting an intrinsic role of disorder in the superconductivity of organic superconductors and a further confirmation of the non-conventional superconductivity in such compounds. (literal)

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