2003/12/22 by K. Tanaka, Kiyohisa Tanaka, T. Yoshida +21 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystallography #Cuprate #Energy (signal processing) #Iron-based superconductors research #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Spectral line #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.70.092503
published as Physical Review B 70, 092503 (2004), Virtual Journal of Applications of Superconductivity, October 1, 2004 · 5 pages,4 figures, 1 table
arxiv created 2003/12/22 · openalex publication_date 2004/09/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Photoemission spectra of underdoped and lightly-doped Bi_2\ensuremath-zPbzSr2Ca_1\ensuremath-xRxCu2O8+y (R=Pr, Er) (BSCCO) have been measured and compared with those of La_2\ensuremath-xSrxCuO4 (LSCO). The lower-Hubbard band of the insulating BSCCO, like Ca2CuO2Cl2, shows a stronger dispersion than La2CuO4 from k\ensuremath∼(\ensuremathπ∕2,\ensuremathπ∕2) to \ensuremath∼(\ensuremathπ,0). The flat band at k\ensuremath∼(\ensuremathπ,0) is found generally deeper in BSCCO. These observations together with the Fermi-surface shapes and the chemical potential shifts indicate that the next-nearest-neighbor hopping \ensuremath|t^\ensuremath'\ensuremath| of the single-band model is larger in BSCCO than in LSCO and that \ensuremath|t^\ensuremath'\ensuremath| rather than the super-exchange J influences the pseudogap energy scale.