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Pseudogap behavior in Bi2Ca2SrCu2O8: Results of the generalized dynamical mean-field approach

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Abstract

Pseudogap phenomena are observed for the normal underdoped phase of different high-T c cuprates. Among others, the Bi2Sr2CaCu2O8 − δ (Bi2212) compound is one of the most studied experimentally. To describe the pseudogap regime in Bi2212, we use a novel generalized ab initio LDA + DMFT + Σk hybrid scheme. This scheme is based on the strategy of one of the most powerful computational tools for real correlated materials: the local density approximation (LDA) + dynamical mean-field theory (DMFT). Conventional LDA + DMFT equations are here supplied with an additional (momentum-dependent) self-energy Σk in the spirit of our recently proposed DMFT + Σk approach taking into account pseudogap fluctuations. In the present model, Σk describes nonlocal correlations induced by short-range collective Heisenberg-like antiferromagnetic spin fluctuations. The effective single-impurity problem of the DMFT is solved by the numerical renormalization group (NRG) method. Material-specific model parameters for the effective x 2 − y 2 orbital of Cu-3d shell of the Bi2212 compound, e.g., the values of intra-and interlayer hopping integrals between different Cu sites, the local Coulomb interaction U, and the pseudogap potential Δ were obtained within the LDA and LDA + DMFT schemes. Here, we report on the theoretical LDA + DMFT + Σk quasiparticle band dispersion and damping, Fermi surface renormalization, momentum anisotropy of (quasi)static scattering, densities of states, spectral densities, and angular-resolved photoemission (ARPES) spectra, taking into account pseudogap and bilayer splitting effects for normal (slightly) underdoped Bi2212 (δ = 0.15). We show that LDA + DMFT + Σk successfully describes strong (pseudogap) scattering close to Brillouin zone boundaries. Our calculated LDA + DMFT + Σk Fermi surfaces and ARPES spectra in the presence of pseudogap fluctuations are almost insensitive to the bilayer splitting strength. However, our LDA-calculated value of bilayer splitting is rather small to describe the experimentally observed peak-dip-hump structure. The results obtained are in good semiquantitative agreement with various recent ARPES experiments.

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Authors and Affiliations

  1. Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg, 620016, Russia

    E. Z. Kuchinskii, I. A. Nekrasov & M. V. Sadovskii

  2. Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg, 620219, Russia

    Z. V. Pchelkina

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  1. E. Z. Kuchinskii
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  2. I. A. Nekrasov
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  3. Z. V. Pchelkina
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  4. M. V. Sadovskii
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Kuchinskii, E.Z., Nekrasov, I.A., Pchelkina, Z.V. et al. Pseudogap behavior in Bi2Ca2SrCu2O8: Results of the generalized dynamical mean-field approach. J. Exp. Theor. Phys. 104, 792–804 (2007). https://doi.org/10.1134/S1063776107050135

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  • DOI: https://doi.org/10.1134/S1063776107050135

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