Abstract
The electron-doped (PCCO) compound in the pseudogap regime was investigated using the angle-resolved photoemission spectroscopy and the generalized dynamical mean-field theory (DMFT) with the -dependent self-energy . 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” -dependent self-energy 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.
- Received 24 June 2009
DOI:https://doi.org/10.1103/PhysRevB.80.140510
©2009 American Physical Society