Volume 59, Number 2, July 2002
|Page(s)||258 - 264|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 July 2002|
Photoemission spectral weight transfer and mass renormalization in the Fermi-liquid system LaSrxTiO
Department of Physics, University of Tokyo - Bunkyo-ku,
Tokyo 113-0033, Japan
2 Department of Complexity Science and Engineering, University of Tokyo Bunkyo-ku, Tokyo 113-0033, Japan
3 Department of Applied Physics, University of Tokyo Bunkyo-ku, Tokyo 113-8656, Japan
Accepted: 30 April 2002
We have performed a photoemission study of LaSrxTiO near the filling-control metal-insulator transition (MIT) as a function of hole doping. The spectral intensity at the chemical potential (μ) and the mass enhancement factor deduced from the bandwidth show qualitatively the same doping dependence as the specific coefficient γ except for near the MIT, where additional mass renormalization may occur in the vicinity of μ. Upon antiferromagnetic ordering, spectral weight transfer occurs from the coherent to the incoherent parts, which we associate with the partial gap opening at μ.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions / 79.60.-i – Photoemission and photoelectron spectra
© EDP Sciences, 2002
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