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Results of low-temperature upper critical field measurements forNd$_{2-x}$Ce$_x$CuO$_{4+\delta}$ single crystals with various $x$ andnonstoichiometric disorder ($\delta$) are presented. The coherence length ofpair correlation $\xi$ and the product $k_F$$\xi$, where $k_F$ is the Fermiwave vector, are estimated. It is shown that for investigated single crystalsparameter $k_F$$\xi$ $\cong$ 100 and thus phenomenologically NdCeCuO - systemis in a range of Cooper-pair-based (BCS) superconductivity.

The estimation of coherence length for electron-doped superconductor Nd$_{2-x}$Ce$_x$CuO$_{4+\delta}$