Archivio Istituzionale della RicercaDirectional point-contact spectroscopy measurements were performed for the first time in state-of-the-art MgB2 single crystals. The selective suppression of the superconductivity in the π band by means of a suitable magnetic field allowed separation of the partial contribution of each band to the total point-contact conductance. By fitting the partial conductance curves σσ(V) and σπ(V), we got an independent determination of the two gaps, Δσ and Δπ, with a strong reduction of the experimental uncertainty. Their temperature dependence was found to agree well with the predictions of the two-band models for MgB2.
Independent determination of the two gaps by directional point-contact spectroscopy in MgB2 single crystals / Gonnelli, Renato; Daghero, Dario; Ummarino, Giovanni; V. A., Stepanov; J., Jun; S. M., Kazakov; J., Karpinski. - In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY. - ISSN 0953-2048. - STAMPA. - 16:2(2003), pp. 171-175. [10.1088/0953-2048/16/2/308]
Independent determination of the two gaps by directional point-contact spectroscopy in MgB2 single crystals
GONNELLI, Renato;DAGHERO, Dario;UMMARINO, Giovanni;
2003
Abstract
Directional point-contact spectroscopy measurements were performed for the first time in state-of-the-art MgB2 single crystals. The selective suppression of the superconductivity in the π band by means of a suitable magnetic field allowed separation of the partial contribution of each band to the total point-contact conductance. By fitting the partial conductance curves σσ(V) and σπ(V), we got an independent determination of the two gaps, Δσ and Δπ, with a strong reduction of the experimental uncertainty. Their temperature dependence was found to agree well with the predictions of the two-band models for MgB2.
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https://hdl.handle.net/11583/1400894
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