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We present measurements of the ab-plane magnetic penetration depth,\lambda(T), in five optimally doped Pr_{1.855}Ce_{0.145}CuO_{4-y} films for 1.6K \leq T \leq T_c \sim 24 K. Low resistivities, high superfluid densitiesn_s(T)\propto \lambda^{-2}(T), high T_c's, and small transition widths arereproducible and indicative of excellent film quality. For all five films,\lambda^{-2}(T)/\lambda^{-2}(0) at low T is well fitted by an exponentialtemperature dependence with a gap, \Delta_{min}, of 0.85 k_B T_c. This behavioris consistent with a nodeless gap and is incompatible with d-wavesuperconductivity.Comment: 5 pages, 4 figures, reorganized for clarit

physical review letters

Evidence for a Nodeless Gap from the Superfluid Density of Optimally Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1.855</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>0.145</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</…

Evidence for a Nodeless Gap from the Superfluid Density of Optimally DopedPr1.855Ce0.145CuO4−