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We show that local-moment screening in a Kondo lattice with d -wave superconducting conduction electrons is qualitatively different from the corresponding single Kondo impurity case. Despite the conduction-electron pseudogap, Kondo-lattice screening is stable if the gap amplitude obeys Δ< TK D, in contrast to the single-impurity condition Δ< TK (where TK is the Kondo temperature for Δ=0 and D is the bandwidth). Our theory explains the heavy electron behavior in the d -wave superconductor Nd2-x Cex Cu O4. © 2008 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics