Upper critical field in electron-doped cuprate superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_{4+\delta }$: two-gap model

Abstract

We present resistivity measurements of the upper critical field (H${}_{c2}$) phase diagram as a function of temperature (T) for Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4+\delta }$/SrTiO${}_3$ single crystal films with different degree of disorder ($\delta$) in magnetic fields up to 90 kOe at temperatures down to 0.4 K. The data are well described by a two-band/two-gap model for a superconductor in the dirty limit.

17 pages, 5 figures, 2 tables

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• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
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