Point-contact spectroscopy was performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-delta. The samples were characterized using X-ray diffraction and scanning electron microscopy equipped with a wavelength-dispersive spectrometer and an electron backscatter diffraction detector. Samples with Ce content x = 0.15 showed the absence of spurious phases and randomly oriented grains, most of which had dimensions of approximately 220 mu m2. The low-bias spectra in the tunneling regime, i.e., high-transparency interface, exhibited a gap feature at about +/- 5 meV and no zero-bias conductance, despite the random oriented grains investigated within our bulk samples, consistent with most of the literature data on oriented samples. High-bias conductance was also measured in order to obtain information on the properties of the barrier. A V-shape was observed in some cases, instead of the parabolic behavior expected for tunnel junctions.

Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors

Nigro, Angela;Guarino, Anita;Grimaldi, Gaia;Romano, Paola
2023-01-01

Abstract

Point-contact spectroscopy was performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-delta. The samples were characterized using X-ray diffraction and scanning electron microscopy equipped with a wavelength-dispersive spectrometer and an electron backscatter diffraction detector. Samples with Ce content x = 0.15 showed the absence of spurious phases and randomly oriented grains, most of which had dimensions of approximately 220 mu m2. The low-bias spectra in the tunneling regime, i.e., high-transparency interface, exhibited a gap feature at about +/- 5 meV and no zero-bias conductance, despite the random oriented grains investigated within our bulk samples, consistent with most of the literature data on oriented samples. High-bias conductance was also measured in order to obtain information on the properties of the barrier. A V-shape was observed in some cases, instead of the parabolic behavior expected for tunnel junctions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4854681
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