Study of the Kondo lattice on La doped CeCoIn$_5$

The effect of non-magnetic impurities on the properties of the Kondo lattice was investigated through nuclear magnetic/quadrupolar resonance (NMR/NQR) experiments on Ce$_{1-x}$La$_x$CoIn$_5$. Specifically, comprehensive $^{115}$In, $^{139}$La NQR and NMR measurements were carried out on single crystals of various La concentration levels (x=0, 2, 3, and 5\%) for temperatures 1.5K-80K and applied magnetic field values 0T-7T. Our results indicate that the ramifications of the Kondo-ion substitution extend well-beyond the vicinity of the particular site, readily affecting the heavy-fermion forming hybridization. It is suggested that the spin polarization around La impurities is modulated on a much larger length scale than that of charge oscillations.