Abstract
The influence of La nonmagnetic impurities on the spin dynamics of CeCoIn${}_{5}$ was studied by inelastic neutron scattering. In La-substituted systems, the spin resonance peak (observed at ${\ensuremath{\Omega}}_{\mathrm{res}}=0.55$ meV in the pure system) is shifted to lower energies but the ratio ${\ensuremath{\Omega}}_{\mathrm{res}}/{k}_{B}{T}_{c}$ remains almost unchanged. The excitation broadens up to an energy of 0.3 meV which is equal to the value of the quasielastic signal in the normal state. The evolution of the excitation as a function of La substitution is compared with Ni- and Zn-substituted YBa${}_{2}$Cu${}_{3}$O${}_{7}$.
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