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Microscopic study of Ni and Zn substitution effects in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori   ; Tokunaga, Yo  ; Haga, Yoshinori  ; Kambe, Shinsaku  ; Ronning, F.*; Zhu, J.-X.*; Thompson, J. D.*; Kotegawa, Hisashi*; To, Hideki*; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*

Heavy fermion superconductor CeCoIn$$_5$$ is considered as a quantum critical antiferromagnetic material. When the In elements are slightly substituted by Zn elements, a long-range antiferromagnetism is induced. On the other hand, slight Sn substitutions make the system step away from the quantum critical point. In the case of Zn substitutions, heterogeneity of antiferromagnetic area in the matrix of heavy fermion state has been microscopically confirmed by NQR measurements. In the case of Ni substitutions for the Co elements, the NQR result appears to be the same as in Sn substituted system.

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