Quasiparticle dispersion of Sr2CuO2Cl2

Nazarenko, Alexander; Vos, K. J. E.; Haas, Stephan; Dagotto, Elbio; Gooding, R. J.

doi:10.1007/bf00727471

Cited by 17 publications

(13 citation statements)

References 6 publications

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“…Attempts to describe the results via calculations of a single hole in an AFM background (tt ′ J or 3-band models) have found difficulty in reproducing the measured energy dispersion, Fig. 14b [110][111][112]. A good fit is found if the system is instead assumed to be in a flux phase [113,114], Fig.…”

Section: Sr2cuo2cl2mentioning

confidence: 99%

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

369

280

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The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the high-Tc cuprates near the composition of optimum Tc. This paper offers a comprehensive survey of the VHS model, describing both theoretical properties and experimental evidence for the picture. Special topics discussed include a survey of the Fermi surfaces of the cuprates and related compounds, and an analysis of the reliability of the slave boson approach to correlation effects. While many properties of the cuprates can be qualitatively understood by a simple rigid-band-filling model, this is inadequate for more quantitative results, since correlation effects tend to pin the Fermi level near the VHS over an extended doping range, and can lead to a nanoscale phase separation. Furthermore, the peaks in the dos lead to competition from other instabilities, both magnetic and structural (related to charge density waves). A novel form of dynamic structural instability, involving dynamic VHS-Jahn-Teller effects has been predicted. Scattered through the literature, there is considerable experimental evidence for both nanoscale phase separation of holes, and for local, possibly dynamic, structural disorder. This review attempts to gather these results into a comprehensive database, to sort the results, and to see how they fit into the Van Hove scenario. Recent experiments on underdoped cuprates are found to provide a strong confirmation that the pseudogap is driven by a splitting of the VHS degeneracy.

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Section: Sr2cuo2cl2mentioning

confidence: 99%

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

369

280

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“…For example, it has been recently remarked that to reproduce the data for Sr 2 CuO 2 Cl 2 , the addition of a small t ′ -term to the 2D t − J model is necessary. [19] Thus, care must be taken when the fine details of different compounds at different dopings are compared. Now consider the inverse photoemission (IPES) (ω > 0) intensity in Fig.…”

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confidence: 99%

Quasiparticle dispersion of thet-Jand Hubbard models

et al. 1995

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The spectral weightA(p, to) of the two-dimensional t jand H-ubbard models has been calculated using exact diagonalization and quantum Monte Carlo techniques, at several densities 0 5~. (n)~1.0. The photoemission (to(0) region contains two dominant distinct features, namely a low-energy quasiparticle peak with bandwidth of order J, and a broad valence band peak at energies of order t. This behavior persists away from half-filling, as long as the antiferromagnetic correlations are robust. The results give support to theories of the copper oxide materials based on the behavior of holes in antiferromagnets, and they also provide theoretical guidance for the interpretation of experimental photoemission data for the cuprates.

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“…All these conclusions cast doubt on results of numerous papers with simplified interpretation of the low-energy ARPES data for Sr 2 CuO 2 Cl 2 made in the framework of the various single-band versions of the t − J model [9,10], and aimed the interpretation of the "experimental quasiparticle dispersion law" supposedly determined from positions of the photocurrent intensity maxima. Unfortunately, the available experimental data do not allow to make so far the reliable conclusions on the nature of the low-energy ARPES feature.…”

Section: Discussionmentioning

confidence: 99%

Large non-adiabatic hole polarons and matrix element effects in the angle-resolved photoemission spectroscopy of dielectric cuprates

Moskvin

Kondrashov

Cherepanov

2002

Physica B: Condensed Matter

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It has been made an extention of the conventional theory based on the assumption of the well isolated Zhang-Rice singlet to be a first electron-removal state in dielectric copper oxide. One assumes the photohole has been localised on either small (pseudo)Jahn-Teller polaron or large non-adiabatic polaron enclosed one or four to five CuO 4 centers, respectively, with active one-center valent ( 1 A 1g − 1,3 E u ) manifold. In the framework of the cluster model we have performed a model microscopic calculation of the k-dependence of the matrix element effects and photon polarization effects for the angle-resolved photoemission in dielectric cuprate like Sr 2 CuO 2 Cl 2 . We show that effects like the "remnant Fermi surface" detected in ARPES experiment for Ca 2 CuO 2 Cl 2 may be, in fact, a reflection of the matrix element effects, not a reflection of the original band-structure Fermi surface, or the strong antiferromagnetic correlations. The measured dispersion-like features in the low-energy part of the ARPES spectra may be a manifestation of the complex momentum-dependent spectral line-shape of the large PJT polaron response, not the dispersion of the well-isolated Zhang-Rice singlet in antiferromagnetic matrix.

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Quasiparticle dispersion of Sr2CuO2Cl2

Cited by 17 publications

References 6 publications

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Quasiparticle dispersion of thet-Jand Hubbard models

Large non-adiabatic hole polarons and matrix element effects in the angle-resolved photoemission spectroscopy of dielectric cuprates

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