Kondo-lattice screening in a d-wave superconductor

Details Kondo-lattice screening in a d-wave superconductor Kondo-lattice screening in a d-wave superconductor

2007-04-13

arxiv.org/abs/0704.1815v3

Phys. Rev. B 77, 125129 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 6 figures, revised version to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.77.125129

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 $\Delta <\sqrt{\tk D}$, in contrast to the single impurity condition $\Delta <\tk$ (where $\tk$ is the Kondo temperature for $\Delta = 0$ and D is the bandwidth). Our theory explains the heavy electron behavior in the d-wave superconductor Nd_{2-x}Ce_{x}CuO_{4}.

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