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We study the electronic and phononic excitations of heavy-fermion metalCeCoIn$_5$ by polarization-resolved Raman spectroscopy to explore theKondo-lattice coherence. Below the coherence temperature T*\,=\,45\,K, thecontinuum of electronic excitations in the XY scattering geometry is suppressedat frequencies below 50\,cm$^{-1}$, whereas the low-frequency continuum in theX'Y' geometry exhibits no change across T*. We relate the suppression to thereduced electron-electron scattering rate resulting from the coherence effect.The presence of suppression in the XY geometry and absence of it in the X'Y'geometry implies that the $\alpha$ and $\beta$ bands become coherent below T*,whereas the $\gamma$ band remains largely incoherent down to 10\,K. Moreover,two optical phonon modes exhibit anomalies in their temperature dependence ofthe frequency and linewidth below T*, which results from developing coherentspectral weight near the Fermi level and reduced electron-phonon scatteringrate. Our results further support the key role of anisotropic hybridization inCeCoIn$_5$.

Anisotropy of Kondo-lattice coherence in momentum space for CeCoIn5