This article is cited in 22 papers

Dynamical Spin Susceptibility in the $t$–$J$ Model: The Memory Function Method

A. A. Vladimirov^a, D. Ihle^b, N. M. Plakida<sup>a

a</sup> Joint Institute for Nuclear Research
^b Universität Leipzig

Abstract: Based on the method of the equations of motion for the relaxation function in terms of Hubbard operators, we evaluate the dynamical spin susceptibility for the $t$–$J$ model in the paramagnetic phase. Using a Mori-type projection technique, we express the relaxation function in terms of the second-order memory function, which is evaluated in the approximation of coupled modes for hole excitations and spin fluctuations in the fourth order in the hopping parameter $t$ and the exchange interaction $J$.

Keywords: strong electron correlations, dynamical spin susceptibility, high-temperature superconductivity, $t$–$J$ model.

Received: 24.03.2005

DOI: 10.4213/tmf1899

 English version: Theoretical and Mathematical Physics, 2005, 145:2, 1576–1589

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