Non-Fermi Liquid Behavior of U-impurity with $f^2$-Singlet Ground State

Details Non-Fermi Liquid Behavior of U-impurity with $f^2$-Singlet Ground State Non-Fermi Liquid Behavior of U-impurity with $f^2$-Singlet Ground State

2001-09-05

arxiv.org/abs/cond-mat/0109072v1

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 6figures

Scientific paper

10.1143/JPSJ.71.389

It is shown by the Wilson's numerical renormalization-group approach that Non-Fermi liquid (NFL) behaviors arise even for U-impurity with an $f^2$-singlet ground state, and all the puzzling behaviors of R$_{1-x}$U$_x$Ru$_2$Si$_2$ (R=Th, Y and La, $x\le 0.07$) can be explained on its basis. There exists an unstable NFL fixed point due to the balance between Kondo singlet and Crystalline-Electric-Field singlet ground states. For wide region in parameter space the system shows the NFL behavior as a transient phenomenon in temperature range accessible by experiment. Results for temperature dependence of the resistivity, the magnetic susceptibility and the Sommerfeld coefficient with and without magnetic field reproduce the behaviors observed in Th$_{1-x}$U$_x$Ru$_2$Si$_2$. Less anomalous properties of R$_{1-x}$U$_x$Ru$_2$Si$_2$ (R=Y and La) can be understood along the same scenario provided that those compounds have different sets of parameters.

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