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The density-matrix renormalization-group method is applied to theone-dimensional Kondo-lattice model with the Coulomb interaction between theconduction electrons. The spin and charge gaps are calculated as a function ofthe exchange constant $J$ and the Coulomb interaction $U_c$. It is shown thatboth the spin and charge gaps increase with increasing $J$ and $U_c$. The spingap vanishes in the limit of $J \rightarrow 0$ for any $U_c$ with anexponential form, $\Delta_s\propto \exp{[-1/\alpha (U_c) J \rho]}$. Theexponent, $\alpha (U_c)$, is determined as a function of $U_c$. The charge gapis generally much larger than the spin gap. In the limit of $J \rightarrow 0$,the charge gap vanishes as $\Delta_c=\frac{1}{2}J$ for $U_c=0$ but for a finite$U_c$ it tends to a finite value, which is the charge gap of the Hubbard model.Comment: RevTeX, 4 pages, 3 Postscript figure

Spin and charge gaps in the one-dimensional Kondo-lattice model with Coulomb interaction between conduction electrons