Kinks in the electronic specific heat.
We find that the heat capacity of a strongly correlated metal presents striking changes with respect to Landau Fermi-liquid theory. In contrast with normal metals, where the electronic specific heat is linear at low temperature (with a T3 term as a leading correction), a dynamical mean-field study of the correlated Hubbard model reveals a clear kink in the temperature dependence, marking a rapid change from a low-temperature linear behavior and a second linear regime with a reduced slope. Experiments on LiV2O4 support our findings, implying that correlated materials are more resistive to cooling at low T than expected from the intermediate temperature behavior.
Toschi
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Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
Capone
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M
Castellani
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C
Held
K
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