Photoemission Spectral Weight Transfer and Mass Renormalization in the Fermi-Liquid System La${}_{1-x}$Sr${}_x$TiO${}_{3+y/2}$

Abstract

We have performed a photoemission study of La${}_{1-x}$Sr${}_x$TiO${}_{3+y/2}$ near the filling-control metal-insulator transition (MIT) as a function of hole doping. Mass renormalization deduced from the spectral weight and the width of the quasi-particle band around the chemical potential $\mu$ is compared with that deduced from the electronic specific heat. The result implies that, near the MIT, band narrowing occurs strongly in the vicinity of $\mu$. Spectral weight transfer occurs from the coherent to the incoherent parts upon antiferromagnetic ordering, which we associate with the partial gap opening at $\mu$.

4 pages, 3 figures

References in corpus (3)

• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• Many-body Effects in Angle-resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State
• Calculation of photoemission spectra of the doped Mott insulator La_{1-x}Sr_xTiO_3 using LDA+DMFT(QMC)

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