Evolution of the Fermi surface of cuprates on the basis of the spin-polaron approach

Барабанов, А. Ф.; Kovalev, Alexey A.; Urazaev, O. V.; Belemuk, A. M.; Hayn, R.

doi:10.1134/1.1371349

Cited by 46 publications

(41 citation statements)

References 51 publications

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“…We should emphasize the decreasing SW scale for spindown component with increasing magnetic field. Decreasing a magnetic field further down to h = 0.5J when magnetic moments form a slightly tilted AFM structure, at low energy for spin-up component we can recognize the picture similar to a dispersion strongly affected by spin fluctuations as was obtained within different methods [18,[41][42][43][44][45][46]. The whole band can be considered as split into two major subbands in agreement with quantum Monte-Carlo calculations [34].…”

Section: Results In Nearest-neighbor Approximationsupporting

confidence: 65%

Influence of varying magnetic order in an external magnetic field on the electronic structure and Fermi surface within the t–J model

2016

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We investigate the electronic structure of the two-dimensional t-J model in a transverse external static magnetic field with canted long-range magnetic order using cluster perturbation theory. Distribution of spectral weight in the whole range of fields from zero to ferromagnetic saturation is explored. We demonstrate the possibility of a sharp change in a distribution of spectral weight in the Brillouin zone at the Fermi level associated with the magnetic correlations when varying magnetic field.

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Section: Results In Nearest-neighbor Approximationsupporting

confidence: 65%

Influence of varying magnetic order in an external magnetic field on the electronic structure and Fermi surface within the t–J model

2016

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“…For this purpose, it is convenient to use the Zwanzig-Mori projection method [41][42][43]. The method for calculating the dispersion curves for spin-polaron excitations in the SFM, which is based on this approach, was described in detail in [44] and was actively used in subsequent studies [45][46][47].…”

Section: Spin-fermion Modelmentioning

confidence: 99%

Coulomb repulsion of holes and competition between $${d_{{x^2} - {y^2}}}$$ d x 2 − y 2 -wave and s-wave parings in cuprate superconductors

Вальков

Dzebisashvili

Korovushkin

et al. 2017

J. Exp. Theor. Phys.

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The effect of the Coulomb repulsion of holes on the Cooper instability in an ensemble of spin-polaron quasiparticles has been analyzed, taking into account the peculiarities of the crystallographic structure of the CuO2 plane, which are associated with the presence of two oxygen ions and one copper ion in the unit cell, as well as the strong spinfermion coupling. The investigation of the possibility of implementation superconducting phases with d-wave and s-wave pairing of the order parameter symmetry has shown that in the entire doping region only the d-wave pairing satisfies the self-consistency equations, while there is no solution for the s-wave pairing. This result completely corresponds to the experimental data on cuprate HTSC. It has been demonstrated analytically that the intersite Coulomb interaction does not affect the superconducting d-wave pairing, because its Fourier transform Vq does not appear in the kernel of the corresponding integral equation.

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“…Comparison of the projection-method results for the a complex spin polaron [6] with the self-consistent Born approximation (SCBA) calculations (at T = 0) [7] certainly indicates that the lower band E …”

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confidence: 99%

“…Pairing with such spin waves S α q takes into account the sharp peak of the spin-spin structure factor in the region close to the antiferromagnetic vector Q and is responsible for the splitting of the lower quasiparticle band appearing in the local polaron approximation [6]. Moreover, the inclusion of the finite region Ω is necessary for describing the correct passage to the limit T → 0.…”

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confidence: 99%

“…The calculation of the spin polaron spectrum with the use of the Emery model [6] provides the spectrum observed in the ARPES experiments in a wide doping range. The assumption of the correspondence between doping in models with free carriers and frustration p in the pure spin model [11] is a key assumption for the description of the properties of the lower polaron band.…”

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On the kinetic equation and electrical resistivity in systems with strong spin-hole interaction

2007

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The problem of constructing the kinetic equation with the description of motion of a hole in systems with strong spin-hole interaction (such as high-temperature superconductors) in terms of the spin polaron has been considered in the framework of the regular antiferromagnetic s − d model. It has been shown by the example of the electrical resistivity that kinetics is determined by the properties of the bands of the spin polaron (rather than "bar hole") and their quasiparticle residues Z k . The cases of low and optimal doping of the CuO2 plane have been considered. It has been shown that the rearrangement of the spectrum of the lower polaron band, as well as the strong doping dependence of the quasiparticle residues Z k is decisive in the unified consideration of these cases.PACS numbers: 71.38.+i, 74.20.Mn, 75.30.Mb, 75.50.Ee It is known that the normal state of high-temperature superconductors is characterized by a complex behavior of the spectral and transport properties due to the strong interaction of the carriers with the spin subsystem [1,2,3]. This refers to the nontrivial evolution of the hole and spin subsystems with increasing doping, when the system passes from the Mott dielectric to the metallic state [4].The overwhelming majority of the studies [5] on the microscopic description of the kinetics in high-temperature superconductors was devoted to the case of the optimal doping and was based on the concept of the almost antiferromagnetic Fermi liquid described by the spin-fermion HamiltonianĤ on the square latticêThe termĤ 0h in the HamiltonianĤ 00 describes the bar Fermi carriers and contains the spectrum ε k of bar holes;Î corresponds to the frustrated antiferromagnetic interaction between S = 1/2 spins, g and d are the vectors of the first and second neighbors, respectively; and * Electronic address: abarab@bk.ru I 1 = (1 − p) and I 2 = pI, where p (0 ≤ p ≤ 1) is the frustration parameter, are the respective antiferromagnetic exchange constants. The term J describes the of the the carriers with the subsystem of localized spins S R ( σ α are the Pauli matrices and the summation over repeated Cartesian superscripts α and spin subscripts γ 1 and γ 2 is implied). The total HamiltonianĤ t includes the interactionĤ f with the electric field E, and dx is the dipole momentum operator.In order to adequately describe the temperature dependence of the electrical resistivity ρ(T ) as well as the Hall coefficient R H (T )) by solving the kinetic equation in the almost antiferromagnetic liquid model, the spectrum ε k in HamiltonianĤ 0h is always changed to the spectrum E(1) k of the lowest quasiparticle band of the spin polaron, and the operators a kσ inĤ 0h are remained fermion operators. The spectrum E(1) k corresponds to a large Fermi surface and is well measured in experiments on angle resolved photoemission spectroscopy (ARPES). Such a change is not obvious and inevitably leads to the incorrect number of holes n h ≈ 1.2 instead of the real relation n h 0.2. However, for the physical quantities appearing ...

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Evolution of the Fermi surface of cuprates on the basis of the spin-polaron approach

Cited by 46 publications

References 51 publications

Influence of varying magnetic order in an external magnetic field on the electronic structure and Fermi surface within the t–J model

Influence of varying magnetic order in an external magnetic field on the electronic structure and Fermi surface within the t–J model

Coulomb repulsion of holes and competition between $${d_{{x^2} - {y^2}}}$$ d x 2 − y 2 -wave and s-wave parings in cuprate superconductors

On the kinetic equation and electrical resistivity in systems with strong spin-hole interaction

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