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We investigate f-electron charge susceptibility in a two-impurity Andersonmodel on the basis of Wilson's numerical renormalization group method. Thef-electron charge susceptibility diverges logarithmically at the critical pointof this model when conduction-electron bands exhibit particle-hole symmetry.Although the critical point disappears without the particle-hole symmetry, thef-electron charge fluctuation is much more enhanced near the crossover regimebetween the Kondo-Yosida singlet and intersite spin-singlet states than that inthe single-impurity case. This result shows that charge fluctuations areenhanced owing to the competition between intersite and Kondo-Yosida spinsinglets. A possible scenario for the enhanced residual resistivity near theregion where the Kondo temperature becomes comparable with the N\'eeltemperatures under pressure in some heavy-fermion compounds is proposed.

Enhanced charge fluctuations due to competitions between intersite and Kondo-Yosida singlet formations in heavy-fermion systems