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 T(3) 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 LiV(2)O(4) support our findings, implying that correlated materials are more resistive to cooling at low T than expected from the intermediate temperature behavior.
Kinks in the Electronic Specific Heat / A., Toschi; M., Capone; Castellani, Claudio; K., Held. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 102:7(2009), pp. 076402-1-076402-4. [10.1103/physrevlett.102.076402]
Kinks in the Electronic Specific Heat
CASTELLANI, Claudio;
2009
Abstract
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 T(3) 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 LiV(2)O(4) support our findings, implying that correlated materials are more resistive to cooling at low T than expected from the intermediate temperature behavior.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
