By Alexandr A. Ovchinnikov, Ivan I. Ukrainskii
Advances within the physics and chemistry of low-dimensional platforms were relatively very good within the previous few many years. countless numbers of quasi-one-dimensional and quasi-two-dimensional structures were synthesized and studied. the most well-liked representatives of quasi-one-dimensional fabrics are polyacethylenes CH  and engaging in donor-acceptor molecular crystals TIF z TCNQ. Examples of quasi-two-dimensional structures are extreme temperature su perconductors (HTSC) in accordance with copper oxides LA2CU04, YBa2Cu306+y and natural superconductors in accordance with BEDT -TIP molecules. The houses of such one- and two-dimensional fabrics aren't but absolutely understood. at the one hand, the equations of movement of one-dimensional sys tems are fairly basic, which allows rigorous ideas of version difficulties. nevertheless, manifestations of assorted interactions in one-dimensional structures are particularly extraordinary. This refers, specifically, to electron--electron and electron-phonon interactions. Even in the restrict of a susceptible coupling con stant electron--electron correlations produce an power hole within the spectrum of one-dimensional metals implying a Mott transition from steel to semiconductor kingdom. In these kinds of circumstances perturbation conception is inapplicable. that's one of many major problems at the method in the direction of a complete concept of quasi-one-dimensional structures. - This assembly held on the Institute for Theoretical Physics in Kiev may perhaps 15-18 1990 was once dedicated to similar difficulties. The papers chosen for this quantity are grouped into 3 sections.
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Advances within the physics and chemistry of low-dimensional platforms were relatively tremendous within the previous couple of many years. enormous quantities of quasi-one-dimensional and quasi-two-dimensional structures were synthesized and studied. the most well-liked representatives of quasi-one-dimensional fabrics are polyacethylenes CH  and undertaking donor-acceptor molecular crystals TIF z TCNQ.
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Extra resources for Electron-Electron Correlation Effects in Low-Dimensional Conductors and Superconductors
C. M. R. E. King: J. Phys. Rev. Lett. 1. K. 1. Pokhodnia Institute for Theoretical Physics, Metrologicheskaya 14 252130 Kiev, USSR 1. Introduction Much interest has been generated in studying the electronic structure and physical properties of cuprate oxides-high-Tc superconductors (HTS) of LaCu-O and Y-Ba-Cu-O types [1, 2]. Some properties of HTS still remain unclarified. In particular several different mechanisms and model of current carriers have been proposed: band conductivity, polaron model, holon mechanism, kink model and so on.
5. e. zero magnetization at any value of u. But the energy values in different valleys are nearly the same. So we can conclude that displacements of total minimum from one valley to another are possible as a result of small perturbations. So, the glass-like behavior of 1-d and 2-d Hubbard systems is possible. Doping of the system and appearance of current carriers leads to the decrease of magnetization as a result of factor (1 - w 2 ) in the kinetic energy of carriers . On the other hand, the magnetic interactions between Cu-O planes in the form leads to the stabilizations of the magnetic long-range order even though the value of Jeff is smaller by order than its value in plane.
The function P~r( G) is inverse to that of Gcr(p') (17). The sum of the neighboring domain widths (a period of twin structure) increases with pressure and also tends to infinity when p' = P~r(G) (Fig. 3). Intertwine boundaries in this case change the thickness insufficiently. The last one may be estimated as the thickness of "walls" of a soliton, being the solution to Eq. (12) when p' = P~r( G). The examples of the coordinate dependencies of oxygen atoms displacement u (from correspondent sites in Cu-Iattice) and the deformation of Cu-Iattice e are represented in Fig.