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How to generate a Kondo hole; A Heavy fermion superconductor CeCoIn$$_5$$ by example

Sakai, Hironori   

In the heavy fermion superconductor CeCoIn$$_5$$, dilute substitutions by Sn or Cd suppress the superconductivity or induce an antiferromagnetically ordered state. Such impurity effects have been microscopically investigated by nuclear quadrupole resonance (NQR) technique. While the Sn substituents weaken electronic correlations and suppress the superconductivity, the Cd substituents induce local moments closely around themselves but the bulk electronic state far from the substituents stays as in a pure CeCoIn$$_5$$. Such a heterogeneous electronic state in the Cd substituted system means a local breakage of Kondo hybridization by non-magnetic Cd substituents.



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