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Title: Pseudogap behavior in the emery model for the electron-doped superconductor Nd{sub 2-x}Ce{sub x}CuO{sub 4}: Multiband LDA + DMFT + {Sigma}{sub k} approach

We propose a generalization of the LDA + DMFT + {Sigma}{sub k} approach to the multiband case, in which correlated and uncorrelated states are present in the model simultaneously. Using the multiband version of the LDA + DMFT + {Sigma}{sub k} approach, we calculate the density of states and spectral functions for the Emery model in a wide energy interval around the Fermi level. We also obtain the Fermi surfaces for the electron-doped high-temperature superconductor Nd{sub 2-x}Ce{sub x}CuO{sub 4} in the pseudogap phase. The self-energy part {Sigma}{sub k} introduced additionally to take into account pseudogap fluctuations describes the nonlocal interaction of correlated electrons with collective Heisenberg short-range spin fluctuations. To solve the effective impurity model, the numerical renorm-group (NRG) method is used for the DMFT equations. Good qualitative agreement of the Fermi surfaces calculated using the LDA + DMFT + {Sigma}{sub k} approach and experimental angle-resolved photoemission spectroscopic data is attained. The stability of the dielectric solution with charge transfer in the Emery model with correction for double counting is analyzed in the Appendix.
Authors:
; ;  [1]
  1. Russian Academy of Sciences, Institute of Electrophysics, Ural Branch (Russian Federation)
Publication Date:
OSTI Identifier:
22210508
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 117; Journal Issue: 2; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DENSITY; DIELECTRIC MATERIALS; DOPED MATERIALS; ELECTRON CORRELATION; ELECTRONS; EQUATIONS; FERMI LEVEL; FLUCTUATIONS; HIGH-TC SUPERCONDUCTORS; PHOTOEMISSION; SELF-ENERGY; SPECTRAL FUNCTIONS; SPIN