Abstract
The electronic structure of ${\mathrm{Nd}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ce}}_{\mathit{x}}$${\mathrm{CuO}}_{4}$(001) single-crystal thin films, which show (1\ifmmode\times\else\texttimes\fi{}1) low-energy electron diffraction patterns, has been studied by angle-resolved ultraviolet photoemission spectroscopy with synchrotron radiation. The data show a well-defined but resolution-limited Fermi edge with a maximum intensity of more than 6% as compared to the main peak intensity. The main peaks exhibit ill-defined dispersion of less than 0.4 eV. All in all, the band calculation can describe the experimental spectra to a fair degree. We find a dispersive bandlike Fermi-liquid state of dominant Cu 3d character (almost no O 2p and Cu 4s character) just below the Fermi level. Its dispersion of 0.2 eV is 8--10 times smaller than that expected from the band calculation. These facts indicate that there is a possibility of Kondo-type renormalized heavy-electron band formation at the Fermi level, caused by spin fluctuations.
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