Upper critical field in electron-doped cuprate superconductor Nd2−xCexCuO4+δ: Two-gap model

A photoemission investigation of the superconducting gap in an electron-doped cuprate superconductor

We have performed angle resolved photoelectron spectroscopy (ARPES) on the electron-doped cuprate superconductor Nd Ce CuO . Evidence is found for an anisotropic superconducting gap that is consistent with the existence of a 1.85 0.15 4 d-wave superconducting order parameter in the n-type cuprate superconductors.  2001 Elsevier Science B.V. All rights

Fermi surface of the electron-doped cuprate superconductor Nd2−xCexCuO4 probed by high- field magnetotransport

We report on the study of the Fermi surface of the electrondoped cuprate superconductor Nd2−xCexCuO4 by measuring the interlayer magnetoresistance as a function of the strength and orientation of the applied magnetic field. We performed experiments in both steady and pulsed magnetic fields on high-quality single crystals with Ce concentrations of x = 0.13–0.17. In the overdoped regime of x > 0....

Resistive upper critical fields and anisotropy of an electron-doped infinite-layer cuprate

Direct measurement of the upper critical field in cuprate superconductors

In the quest to increase the critical temperature Tc of cuprate superconductors, it is essential to identify the factors that limit the strength of superconductivity. The upper critical field Hc2 is a fundamental measure of that strength, yet there is no agreement on its magnitude and doping dependence in cuprate superconductors. Here we show that the thermal conductivity can be used to directl...

Decrease of upper critical field with underdoping in cuprate superconductors

It is still unclear why the transition temperature Tc of cuprate superconductors falls with underdoping. The doping dependence of the critical magnetic field Hc2 is directly relevant to this question, but different estimates of Hc2 are in sharp contradiction. We resolve this contradiction by tracking the characteristic field scale of superconducting fluctuations as a function of doping, via mea...