Short report
Features of the properties of the pseudogap state in HTSC cuprates
V. I. Kuz’min
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok St., 50, 660036, Krasnoyarsk, Russia
S. G. Ovchinnikov
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok St., 50, 660036, Krasnoyarsk, Russia
T. M. Ovchinnikova
Sukachev Institute of Forest, Akademgorodok St., 50, 660036, Krasnoyarsk, Russia
Abstract
This paper discusses the complex structure of the pseudogap state in high-temperature superconductors based on cuprates of the La2-xSrxCuO4 type and other similar quasi-two-dimensional compounds whose common structural elements are CuO2 layers. Conclusions from experimental data on angle-resolved photoemission spectroscopy, inelastic neutron scattering, and other methods regarding variants of the «phase diagram» of the pseudogap state in the plane (doping p, temperature T) are briefly discussed. In particular, in addition to the most widely known variant with the T* line, a variant with two types of the pseudogap is discussed: the weak pseudogap between T* and T**, and the strong pseudogap below T**. This type of phase diagram was already assumed at the dawn of high-temperature superconductivity to interpret the experimental data on magnetic susceptibility, although it is not very popular in the literature. However, it is consistent with a number of modern theoretical studies carried out using cluster calculations, as well as with the results of transport measurements. It’s worth noting that the ability to correctly account for nonlocal correlations has recently made it possible to qualitatively describe the electronic structure of the pseudogap region. In particular, the authors discuss their results obtained within the framework of cluster perturbation theory for the two-dimensional Hubbard model with various doping and temperature values using clusters of 12 and 16 sites.
Keywords: cuprates, strong electronic correlations, short-range antiferromagnetic order, phase diagram, strong pseudogap, weak pseudogap.
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