Key features of the hole spectrum in three-band Hubbard model for High-Tc superconductors

Барабанов, А. Ф.; Beresovsky, V.M.; Ža̧sinas, E.; Maksimov, L. A.

doi:10.1016/0921-4534(95)00469-6

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Although the shapes and magnitudes of the experimental and calculated dispersions along the nodal direction [from (0, 0) to (π, π)] are close, along the boundary of the magnetic Brillouin zone [from (0, π) to (π, 0)] the magnitude of the calculated dispersion is an order of magnitude smaller than the experimental one. A possible reason for this discrepancy is the oversimplified hole hopping term in Hamiltonian (1) which takes into account the transfer between nearest neighbor sites only [23,25].…”

Section: The Hole Spectrummentioning

confidence: 99%

Two-dimensional t-J model at moderate doping

Sherman

Schreiber

2003

The European Physical Journal B - Condensed Matter

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Using the method which retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering, spectral and magnetic properties of the two-dimensional t-J model in the normal state are investigated for the ranges of hole concentrations 0 ≤ x ≤ 0.16 and temperatures 0.01t ≤ T ≤ 0.2t. The used hopping t and exchange J parameters of the model correspond to hole-doped cuprates. The obtained solutions are homogeneous which indicates that stripes and other types of phase separation are not connected with the strong electron correlations described by the model. A series of nearly equidistant maxima in the hole spectral function calculated for low T and x is connected with hole vibrations in the region of the perturbed short-range antiferromagnetic order. The hole spectrum has a pseudogap in the vicinity of (0, π) and (π, 0). For x ≈ 0.05 the shape of the hole Fermi surface is transformed from four small ellipses around (±π/2, ±π/2) to two large rhombuses centered at (0, 0) and (π, π). The calculated temperature and concentration dependencies of the spin correlation length and the magnetic susceptibility are close to those observed in cuprate perovskites. These results offer explanations for the observed scaling of the static uniform susceptibility and for the changes in the spin-lattice relaxation and spin-echo decay rates in terms of the temperature and doping variations in the spin excitation spectrum of the model. PACS. 71.10.Fd Lattice fermion models -74.25.Ha Magnetic properties -74.25.Jb Electronic structure

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Section: The Hole Spectrummentioning

confidence: 99%

Two-dimensional t-J model at moderate doping

Sherman

Schreiber

2003

The European Physical Journal B - Condensed Matter

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“…As it is seen from Fig.1(a), the inclusion of the Q-wave qualitatively leads to the decoupling of the lowest band of the local small polaron excitations and ε 1 (k) is close to ε 1 (k). This means that the main features of the lowest band excitations previously calculated in the local polaron approximation [7] are preserved.…”

mentioning

confidence: 68%

“…A + k,σ,j are the Fourier transforms of A + R,σ,j . Let us mind, that in our previous investigations [7] this basis of local spin-polaron operators lead to the proper description of the experimentally observed important features of the CuO 2 plane hole spectrum: extended saddle point and isotropic band bottom.…”

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confidence: 99%

Redistribution of the hole spectral weight due to longrange spin correlations in the three-band Hubbard model

et al. 1997

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In the framework of the three-band model for CuO 2 plane in hightemperature superconductors the spectrum of the spin-polaron hole exitation is investigated. The problem is treated taking into account the coupling of a local polaron with the antiferromagnetic spin wave with Q = (π, π).This leads to the essential changes of the lowest polaron band ǫ 1 (k) and the strong redistribution of the bare electron filling. PACS number(s): 74.72.-h. 75.10-b In order to understand the nature of high-temperature superconductors it is important to describe properly the motion of a hole in the CuO 2 plane [1,2]. This motion takes place on the antiferromagnetic (AFM) spin background of copper spins and it must be treated as a correlated motion of a hole coupled to spin excitations (a spin polaron). Usually the spin polaron is studied within the frameworks of the t-J model [1] and the three-band Hubbard model [3,4,5]. In the previous works the spin polaron problem was studied mainly in the approximation of a small radius polaron ( an analogous of a Zang -Rise polaron). In the present work, for the first time, the long range order of the AFM background is taken into account by introducing an additional new spin polaron of an infinite radius -a bound state of a charge exitation and a spin wave with Q = (π, π).We shall show that the introduction of such a 1

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The Origin of an Inflection Point on the Temperature Dependence of the London Penetration Depth in Hole-Doped Cuprate High-Temperature Superconductors

Komarov

Dzebisashvili

2021

J. Exp. Theor. Phys.

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Key features of the hole spectrum in three-band Hubbard model for High-Tc superconductors

Cited by 3 publications

References 16 publications

Two-dimensional t-J model at moderate doping

Two-dimensional t-J model at moderate doping

Redistribution of the hole spectral weight due to longrange spin correlations in the three-band Hubbard model

The Origin of an Inflection Point on the Temperature Dependence of the London Penetration Depth in Hole-Doped Cuprate High-Temperature Superconductors

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