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We have investigated the doping dependence of the penetration depth vs.temperature in electron doped Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$ using a modelwhich assumes the uniform coexistence of (mean-field) antiferromagnetism andsuperconductivity. Despite the presence of a $d_{x^2-y^2}$ pairing gap in theunderlying spectrum, we find nodeless behavior of the low-$T$ penetration depthin underdoped case, in accord with experimental results. As doping increases, alinear-in-$T$ behavior of the penetration depth, characteristic of d-wavepairing, emerges as the lower magnetic band crosses the Fermi level and createsa nodal Fermi surface pocket.

Nodeless d-wave superconducting pairing due to residual antiferromagnetism in underdoped Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$