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

Abstract

We have performed an in situ angle-resolved photoemission spectroscopy (ARPES) on single-crystal surfaces of La${}_{0.6}$Sr${}_{0.4}$MnO${}_3$ (LSMO) thin films grown on SrTiO${}_3$ (001) substrates by laser molecular beam epitaxy, and investigated the electronic structure near the Fermi level ($E_F$). The experimental results were compared with the band-structure calculation based on LDA + $U$. The band structure of LSMO thin films consists of several highly dispersive O 2$p$ derived bands in the binding energy range of 2.0 - 6.0 eV and Mn 3$d$ derived bands near $E_F$. ARPES spectra around the $Gamma$ point show a dispersive band near $E_F$ indicative of an electron pocket centered at the $Gamma$ point, although it was not so clearly resolved as an electronlike pocket due to the suppression of spectral weight in the vicinity of $E_F$. Compared with the band-structure calculation, the observed conduction band is assigned to the Mn 3$d{e}_g$ majority-spin band responsible for the half-metallic nature of LSMO. We have found that the estimated size of the Fermi surface is consistent with the prediction of the band-structure calculation, while the band width becomes significantly narrower than the calculation. Also, the intensity near $E_F$ is strongly reduced. The origin of these discrepancies between the experiment and the calculation is discussed.

7 pages, 5 figures

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Cited by in corpus (12)

• Ferrodistortive instability at the (001) surface of half-metallic manganites
• Mass enhancement in 3d and s-p perovskites from symmetry breaking
• Momentum-resolved electronic structure at a buried interface from soft x-ray standing-wave angle-resolved photoemission
• Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La${}_{1-x}$Sr${}_x$MnO${}_3$
• Digging up bulk band dispersion buried under a passivation layer
• Effect of strong localization of doped holes in angle-resolved photoemission spectra of La${}_{1-x}$Sr${}_x$FeO${}_3$
• Angle-resolved photoemission spectroscopy of perovskite-type transition-metal oxides and their analyses using tight-binding band structure
• Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite La${}_{0.6}$Sr${}_{0.4}$MnO${}_3$
• In-situ photoemission study of Pr_{1-x}Ca_xMnO_3 epitaxial thin films with suppressed charge fluctuations
• Re-examination of half-metallic ferromagnetism for doped LaMnO3 in quasiparticle self-consistent $GW$ method
• Systematic tight-binding analysis of ARPES spectra of transition-metal oxides
• The electronic structure of La${}_{1-x}$Sr${}_x$MnO${}_3$ thin films and its $T_c$ dependence as studied by angle-resolved photoemission