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Report No.

NMR study of Zn- and Ni-substitution effect in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori   ; Tokunaga, Yo  ; Haga, Yoshinori   ; Kambe, Shinsaku  ; Zhu, J.-X.*; Ronning, F.*; Ramakrishna, S. K.*; Reyes, A. P.*; Kotegawa, Hisashi*; To, Hideki*; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*

In heavy fermion superconductor CeCoIn$$_5$$, slight Zn substitutions for In atoms induce antiferromagnetism, while slight Ni substitutions for Co atoms suppress superconductivity. The both substituted CeCoIn$$_5$$ exhibit non- fermi-liquid behaviors near the phase boundaries which have been detected by magnetization and specific heat measurements. We have performed NMR experiments in these systems to investigate the microscopic effects by substituents. We will discuss about the spin fluctuations near the boundaries by NMR relaxation rates.



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