Dielectrics

Anomalous thermodynamics of the doped Mott–Hubbard insulators

S. G. Ovchinnikov^abc, K. A. Sidorov^a, E. I. Shneider<sup>ab

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b M. F. Reshetnev Siberian State Aerospace University,
^c Siberian Federal University, Krasnoyarsk

Abstract: The concentration dependence of the entropy of doped Mott-Hubbard insulators has been considered within the $t$–$J$ model. It has been shown that a change in the type and statistics of charge carriers as compared to the Fermi gas leads to a radical change in the entropy $s$, in particular, to the giant growth of the entropy upon doping. The quantity $(\partial s)/(\partial x)\approx k_B$ is approximately consistent with the experimental data for HTSC cuprates in the pseudogap phase.

Received: 25.05.2010

 English version: Physics of the Solid State, 2011, 53:2, 299–302

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