Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 13 November 2023 / Approved: 14 November 2023 / Online: 14 November 2023 (11:39:14 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Keywords

electron-doped cuprates; point-contact spectroscopy; tunnelling

Subject

Physical Sciences, Condensed Matter Physics

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