Nigro, A.; Guarino, A.; Leo, A.; Grimaldi, G.; Avitabile, F.; Romano, P. Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors. Materials2023, 16, 7644.
Nigro, A.; Guarino, A.; Leo, A.; Grimaldi, G.; Avitabile, F.; Romano, P. Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors. Materials 2023, 16, 7644.
Nigro, A.; Guarino, A.; Leo, A.; Grimaldi, G.; Avitabile, F.; Romano, P. Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors. Materials2023, 16, 7644.
Nigro, A.; Guarino, A.; Leo, A.; Grimaldi, G.; Avitabile, F.; Romano, P. Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors. Materials 2023, 16, 7644.
Abstract
Point-contact spectroscopy has been performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-. The samples were characterized by X-ray diffraction and scanning electron microscopy equipped with a wavelength dispersive spectrometer and an electron backscatter diffraction detector. The samples with a Ce content x = 0.15, show the absence of spurious phases and randomly oriented grains, most of which have dimensions of approximately 220 µm2. The low-bias spectra in the tunnelling regime, i.e., high transparency interface, exhibit a gap feature at about ±5 meV and no zero-bias conductance, consistent with the most literature data on oriented samples. The high-bias conductance has also been measured in order to obtain information on the properties of the barrier. A V-shape has been in some cases observed, instead of the parabolic behavior expected for tunnel junctions.
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