Slave-boson based configuration-interaction approach for the Hubbard model

Seibold, G.

doi:10.1103/physrevb.77.235109

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…The doped hole charge is mainly confined to the oxygen plaquette around the polaron center with a strongly reduced (and slightly ferromagnetically polarized) Cu moment. It is noteworthy that the superposition of such states within a configuration-interaction approach [23], leads to a dispersion relation for the spin-polaron similar to that obtained in the tJ-model for the single-hole state (e.g. [24]).…”

Section: Electronic Phase Separation In Cuprates: From Early Theoriesmentioning

confidence: 82%

Electronic Phase Separation and Electron–Phonon Coupling in Cuprate Superconductors

Bill

Hizhnyakov

Seibold

2017

High-Tc Copper Oxide Superconductors and Related Novel Materials

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PrologueImmediately after the discovery of high-temperature superconductivity by Bednorz and Müller [1] late Ernst Sigmund and his group at the University of Stuttgart started to work on the problem how doping of charge carriers alters the electronic properties of the perovskite material. These efforts were supported by Vladimir Hizhnyakov from the University of Tartu, who together with Ernst Sigmund proposed an inhomogeneous doping mechanism for the cuprates in 1988 [2][3][4][5]. According to their picture the individual charge carriers form localized magnetic polarons in a fluctuating antiferromagnetic environment which then cluster together to form metallic regions (cf. Fig. 1.1). Above some critical doping a percolative network is realized, which then becomes superconducting. During these early days, such a scenario was viewed with scepticism by the high-T c community, in particular because only few experiments supported some kind of electronic phase separation in the cuprates. By a lucky coincidence, Reinhard Kremer from the nearby Max-Planck institute in Stuttgart started thermal quenching experiments on lanthanum cuprates which strongly supported the formation of an electronically inhomogeneous state in these materials. Alex Müller, who had an established, close contact

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Section: Electronic Phase Separation In Cuprates: From Early Theoriesmentioning

confidence: 82%

Electronic Phase Separation and Electron–Phonon Coupling in Cuprate Superconductors

Bill

Hizhnyakov

Seibold

2017

High-Tc Copper Oxide Superconductors and Related Novel Materials

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Spin canting as a result of the competition between stripes and spirals in cuprates

2011

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Based on the extended Hubbard model we calculate the energy of stripe and spiral ground states. We find that uniform spirals get favored by a large t ′ /t ratio but are unstable at small doping towards stripes and checkerboard textures with spin canting. The structure of these inhomogeneities also depends on t ′ /t and the associated spin currents may induce a small lattice distortion associated with local dipole moments. We discuss a new kind of stripe which appears as a domain wall of the antiferromagnetic (AF) order parameter with a fractional change of the phase of the AF order. For large |t ′ /t| spirals can be stabilized under certain conditions in the overdoped regime which may explain the elastic incommensurate magnetic response recently observed in iron-codoped Bi2201 materials.

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Spin-polaron concept in the theory of normal and superconducting states of cuprates

Вальков¹,

Dzebisashvili²,

Korovushkin³

et al. 2021

Phys.-Usp.

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The review discusses the emergence of the spin-fermion model of cuprates and the formation of the spin-polaron concept of the electronic structure of hole-doped cuprate superconductors. This concept has allowed describing the properties of cuprates in the normal phase as well as the features of superconducting pairing in the unified approach. The derivation of the spin-fermion model from the Emery model in the regime of strong electronic correlations is described, demonstrating the appearance of strong coupling between the spins of copper ions and holes on oxygen ions. Such a strong interaction against the background of the singlet state of the spin subsystem of copper ions (quantum spin liquid) leads to the formation of special Fermi quasiparticles — nonlocal spin polarons. Under doping, the spin-polaron ensemble exhibits instability with respect to superconducting d-wave pairing, whereas superconducting s-wave pairing is not implemented. At the optimal doping, the transition to the superconducting phase occurs at temperatures corresponding to experimental data. It is shown that the superconducting d-wave pairing of spin-polaron quasiparticles is not suppressed by the Coulomb repulsion of holes located on neighboring oxygen ions. It is emphasized that, when the spec-tral characteristics of spin-polaron quasiparticles are taken into account, the calculated temperature and doping dependences of the London penetration depth are in good agreement with experimental data.

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Slave-boson based configuration-interaction approach for the Hubbard model

Cited by 3 publications

References 57 publications

Electronic Phase Separation and Electron–Phonon Coupling in Cuprate Superconductors

Electronic Phase Separation and Electron–Phonon Coupling in Cuprate Superconductors

Spin canting as a result of the competition between stripes and spirals in cuprates

Spin-polaron concept in the theory of normal and superconducting states of cuprates

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