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Evolution of Midgap States and Residual Three Dimensionality in La 2 − x Sr x CuO 4

2005; American Physical Society; Volume: 95; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.95.157601

1092-0145

S. Sahrakorpi, M. Lindroos, R.S. Markiewicz, Arun Bansil,

Magnetic and transport properties of perovskites and related materials

We have carried out extensive first principles doping-dependent computations of angle-resolved photoemission (ARPES) intensities in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) over a wide range of binding energies. Intercell hopping and the associated 3-dimensionality, which is usually neglected in discussing cuprate physics, is shown to play a key role in shaping the ARPES spectra. Despite the obvious importance of strong coupling effects (e.g. the presence of a lower Hubbard band coexisting with mid-gap states in the doped insulator), we show that a number of salient features of the experimental ARPES spectra are captured to a surprisingly large extent when effects of $k_z$-dispersion are properly included in the analysis.