Point-Contact Spectroscopy in Bulk Samples of Electron-Doped Cuprate Superconductors.
Materials (Basel)
; 16(24)2023 Dec 14.
Article
in En
| MEDLINE
| ID: mdl-38138787
ABSTRACT
Point-contact spectroscopy was performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-δ. 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 µm2. 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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Materials (Basel)
Year:
2023
Document type:
Article
Affiliation country:
Italy