Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La$_{1-x}$Sr$_{x}$MnO$_{3}$

Details Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La$_{1-x}$Sr$_{x}$MnO$_{3}$ Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La$_{1-x}$Sr$_{x}$MnO$_{3}$

2007-05-04

arxiv.org/abs/0705.0621v1

Phys. Rev. B 76, 201103(R) (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.201103

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.

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