Effect of Rattling Phonons on Sommerfeld Constant

Details Effect of Rattling Phonons on Sommerfeld Constant Effect of Rattling Phonons on Sommerfeld Constant

2008-08-30

arxiv.org/abs/0809.0044v1

J. Phys. Soc. Jpn. 77, 103711 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, to appear in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.77.103711

By employing a numerical renormalization group technique, we evaluate electronic specific heat coefficient $\gamma$ of the Anderson model coupled with local anharmonic phonons for the oscillation of a caged atom. For the rattling-type cage potential with a flat and wide region in the bottom, we find that phonon-mediated attraction is largely enhanced. When the potential shape is deformed from the rattling type, there occurs a cancellation between Coulomb repulsion and the phonon-mediated attraction. In such a situation, spin and charge fluctuations are comparable to each other, leading to the realization of exotic electron-phonon complex state with large and magnetically robust $\gamma$.

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