Electronic structure of Pr(2-x)CexCuO(4) studied via ARPES and LDA plus DMFT+Sigma(k)

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    RENORMALIZATION-GROUP APPROACH;    DILUTE MAGNETIC-ALLOYS;    ANDERSON MODEL;    CUPRATE SUPERCONDUCTORS;    PSEUDOGAP BEHAVIOR;    STATIC PROPERTIES;    DENSITY;    PHASE;    FLUCTUATIONS;   

DOI  :  10.1103/PhysRevB.80.140510

来源: SCIE

【 摘 要 】

The electron-doped Pr2-xCexCuO4 (PCCO) compound in the pseudogap regime (x approximate to 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+Sigma(k)). 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 Sigma(k) 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.

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