Journal
EUROPHYSICS LETTERS
Volume 59, Issue 2, Pages 258-264Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2002-00235-7
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We have performed a photoemission study of La1-xSrxTiO3+y/2 near the filling-control metal-insulator transition (MIT) as a function of hole doping. The spectral intensity at the chemical potential (mu) and the mass enhancement factor deduced from the bandwidth show qualitatively the same doping dependence as the specific coefficient gamma except for near the MIT, where additional mass renormalization may occur in the vicinity of mu. Upon antiferromagnetic ordering, spectral weight transfer occurs from the coherent to the incoherent parts, which we associate with the partial gap opening at mu
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