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.

arXiv comment11 pages, 4 figures

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• Gate tunable spin-orbit coupling and weak antilocalization effect in an epitaxial La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$ thin film
• 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
• Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance
• Systematic tight-binding analysis of ARPES spectra of transition-metal oxides