Magnetic and transport anisotropy of electron-doped Nd2-Ce CuO4+δ with oxygen nonstoichiometric disorder

Клепикова, А. С.; Charikova, T. B.; Popov, M. R.; Степанова, Е. А.; Иванов, А. А.

doi:10.1016/j.physe.2022.115532

Cited by 1 publication

(1 citation statement)

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“…Since a very high anisotropy is found in NCCO single crystals with an out-ofplane resistivity ρ c five orders of magnitude larger than the in-plane resistivity ρ ab , we assume ρ = ρ ab and for the 2D system ρl = hc o /e 2 k F , where c o = 0.6 nm is the distance between two adjacent CuO 2 layers in NCCO unit cell and k F ≈ 3 nm −1 is the Fermi wave vector for the NCCO material. [9,[67][68][69][70]. Based on the Sharvin formula, we found the junction size to be d = 7 nm and d = 4 nm, respectively.…”

Section: Low-bias Conductancementioning

confidence: 86%

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

Nigro,

Guarino,

Leo

et al. 2023

Materials

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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.

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