arXiv 0705.06212007-05-04cond-mat.str-el

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

A. Chikamatsu, H. Wadati, H. Kumigashira, M. Oshima, A. Fujimori, M. Lippmaa, K. Ono, M. Kawasaki, H. Koinuma

备注：: 11 pages, 4 figures
发表信息：: Phys. Rev. B 76, 201103(R) (2007).
DOI：: 10.1103/PhysRevB.76.201103

英文摘要：

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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