Reviews of topical problems

Quasiparticles in strongly correlated electron systems in copper oxides

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation

New experimental and theoretical results on the electronic structure and spectral properties of quasiparticles in copper oxides are reviewed. It is shown that the electronic structure transforms from antiferromagnetic insulators to optimally doped high-temperature superconductors as the doping level is varied. The experimental methods considered are primarily angular resolved photoelectron spectroscopy (ARPES), neutron scattering, and NMR. Two types of electronic structure calculations for data interpretation purposes are considered, namely, exact numerical methods for finite clusters (exact diagonalization and the quantum Monte Carlo method) and approximate schemes for an infinite lattice. As a result, a coherent unified picture emerges, in which magnetic polarons (which are carriers in a weakly doped antiferromagnetic lattice) transform into a system of Fermi quasiparticles dressed in short-range antiferromagnetic-type spin fluctuations. In the region of weakly doped metallic compositions, deviations from Fermi-liquid properties are seen, such as the failure of Luttinger’s theorem, shadowy photoemission bands, and the spin pseudogap effect in spectral and thermodynamic measurements. The situation in the neighborhood of the insulator-metal concentration transition is noted to be least understood.

Fulltext is available at IOP
PACS: 71.27.+a, 74.25.Jb (all)
DOI: 10.1070/PU1997v040n10ABEH000289
Citation: Ovchinnikov S G "Quasiparticles in strongly correlated electron systems in copper oxides" Phys. Usp. 40 993–1017 (1997)
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Оригинал: Овчинников С Г «Квазичастицы в сильно коррелированной электронной системе оксидов меди» УФН 167 1043–1068 (1997); DOI: 10.3367/UFNr.0167.199710b.1043

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