Effect of Rattling Phonons on Sommerfeld Constant - Condensed Matter > Strongly Correlated Electrons

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Abstract: By employing a numerical renormalization group technique, we evaluateelectronic specific heat coefficient $\gamma$ of the Anderson model coupledwith local anharmonic phonons for the oscillation of a caged atom. For therattling-type cage potential with a flat and wide region in the bottom, we findthat phonon-mediated attraction is largely enhanced. When the potential shapeis deformed from the rattling type, there occurs a cancellation between Coulombrepulsion and the phonon-mediated attraction. In such a situation, spin andcharge fluctuations are comparable to each other, leading to the realization ofexotic electron-phonon complex state with large and magnetically robust$\gamma$.

Autor: Takashi Hotta

Fuente: https://arxiv.org/