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Cu NMR study in a heavy-electron system, CaCu$$_3$$Ru$$_4$$O$$_{12}$$

Kato, Harukazu*; Tsuruta, Takuya*; Nishioka, Takashi*; Matsumura, Masahiro*; Sakai, Hironori   ; Kambe, Shinsaku  

Cu NMR measurements have been carried out for CaCu$$_3$$Ru$$_4$$O$$_{12}$$, which shows a heavy-fermion-like behavior although it posseses no f electron moment. The field-sweep spectrum observed can be understood as a powder pattern of a Cu nucleus affected by the quadrupole interaction with no axial symmetry. The quadrupole parameters and the Knight shift of Cu are evaluated.



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