Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-29
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, J. Phys. Soc. Jpn. 79 (2010) in press
Scientific paper
We investigate f-electron charge susceptibility in a two-impurity Anderson model on the basis of Wilson's numerical renormalization group method. The f-electron charge susceptibility diverges logarithmically at the critical point of this model when conduction-electron bands exhibit particle-hole symmetry. Although the critical point disappears without the particle-hole symmetry, the f-electron charge fluctuation is much more enhanced near the crossover regime between the Kondo-Yosida singlet and intersite spin-singlet states than that in the single-impurity case. This result shows that charge fluctuations are enhanced owing to the competition between intersite and Kondo-Yosida spin singlets. A possible scenario for the enhanced residual resistivity near the region where the Kondo temperature becomes comparable with the N\'eel temperatures under pressure in some heavy-fermion compounds is proposed.
Hattori Kazumasa
Miyake Kazumasa
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