Phys. Rev. B 80, 140510(R) (2009) [4 pages]Electronic structure of Pr2−xCexCuO4 studied via ARPES and LDA+DMFT+Σk
The electron-doped Pr2−xCexCuO4 (PCCO) compound in the pseudogap regime (x≈0.15) was investigated using the angle-resolved photoemission spectroscopy and the generalized dynamical mean-field theory (DMFT) with the k-dependent self-energy (LDA+DMFT+Σk). Model parameters (hopping integral values and local Coulomb interaction strength) for the effective one-band Hubbard model were calculated by the local-density approximation (LDA) with numerical renormalization-group method employed as an “impurity solver” in DMFT computations. An “external” k-dependent self-energy Σk was used to describe interaction of correlated conducting electrons with short-range antiferromagnetic (AFM) pseudogap fluctuations. Both experimental and theoretical spectral functions and Fermi surfaces were obtained and compared demonstrating a good semiquantitative agreement. For both experiment and theory normal-state spectra of nearly optimally doped PCCO show clear evidence for a pseudogap state with AFM-like nature. Namely, folding of quasiparticle bands as well as the presence of the “hot spots” and “Fermi arcs” was observed. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.140510
DOI:
10.1103/PhysRevB.80.140510
PACS:
74.72.−h, 74.20.−z, 74.25.Jb, 31.15.A−
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