Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La${}_{1-x}$Sr${}_x$MnO${}_3$

Abstract

We report the first observation of changes in the electronic structure of La${}_{1-x}$Sr${}_x$MnO${}_3$ (LSMO) across the filling-control metal-insulator (MI) transition by means of in situ angle-resolved photoemission spectroscopy (ARPES) of epitaxial thin films. The Fermi surface gradually disappears near the MI transition by transferring the spectral weight from the coherent band near the Fermi level ($E_F$) to the lower Hubbard band, whereas a pseudogap behavior also exists in the ARPES spectra in the close vicinity of $E_F$ for the metallic LSMO. These results indicate that the spectral weight transfer derived from strong electron-electron interaction dominates the gap formation in LSMO associated with the filling-control MI transition.

11 pages, 4 figures

References in corpus (2)

• The band structure and Fermi surface of La${}_{0.6}$Sr${}_{0.4}$MnO${}_3$ thin films studied by in-situ angle-resolved photoemission spectroscopy
• Angle-resolved photoemission spectroscopy of perovskite-type transition-metal oxides and their analyses using tight-binding band structure

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• Electronic structure of SrTi${}_{1-x}$V${}_x$O${}_3$ films studied by $insitu$ photoemission spectroscopy: Screening for a transparent electrode material
• Studying the holographic Fermi surface in the scalar induced anisotropic background
• Systematic tight-binding analysis of ARPES spectra of transition-metal oxides