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A Cu NQR study in a $$d$$-electron heavy-fermion system, CaCu$$_{3}$$Ru$$_{4}$$O$$_{12}$$

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

Cu nuclear quadrupole resonance (NQR) studies have been carried out for CaCu$$_{3}$$Ru$$_{4}$$O$$_{12}$$,which has been suggested to show a heavy-fermion-like behavioral though it possess no f electron. A Lorentzian shape of the Cu NQR line with a narrow width implies that no magnetic ordering appears, at least, down to 5 K. The spin-lattice relaxation rate of the Cu nuclei probes a change of the Cu 3$$d$$ electron nature, resulting in the Fermi liquid state at a low temperature. These facts strongly support that the heavy fermion picture is available in the concerned compound.

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Category:Chemistry, Multidisciplinary

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