Low Temperature Physics: 33, 625 (2007); https://doi.org/10.1063/1.2755210 (5 pages)
Физика Низких Температур: Том 33, Выпуск 6-7 (Июнь 2007), c. 814-819    ( к оглавлению , назад )

Heat capacity and spin susceptibility of two-dimensional t-J model

T.N. Antsygina, M.I. Poltavskaya, I.I. Poltavsky, and K.A. Chishko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: chishko@ilt.kharkov.ua

Received October 20, 2006


Thermodynamic properties of the t–J model on square and triangular lattices near half-filling are investigated theoretically within an analytical approach based on the Kondo and Yamaji’s Green function decoupling scheme. The temperature dependences of the heat capacity and spin susceptibility are calculated in the wide temperature range for the case when the exchange constant J is greater than the hopping amplitude t. It was found, that with the increase of doping from the half-filling, the maximum of the spin susceptibility increases and its position shifts to lower temperatures for both types of lattices. Such behavior is in agreement with the qualitative predictions [E. Dagotto, Rev. Mod. Phys. 66, 763 (1994)]. Heat capacity demonstrates a double peak shape. The high temperature peak associated with the «spin wave-like» excitations shifts to lower temperatures with doping. The low temperature peak appears due to the holes and its height and position depend on both the doping and the ratio t/J.

PACS: 71.10.Fd Lattice fermion models (Hubbard model, etc.);
PACS: 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.).

Ключевые слова: two-dimensional t–J model, heat capacity, susceptibility.