We have performed an in situ angle-resolved photoemission spectroscopy (ARPES) on single-crystal surfaces of La0.6 Sr0.4 MnO3 (LSMO) thin films to investigate the electronic structure near the Fermi level (EF). ARPES spectra near EF reveal the existence of a dispersive Mn-3d derived conduction band indicative of an electron pocket centered at the Γ point. Comparing the experimental band structure with the local density approximation + U band-structure calculation, the estimated size of the Fermi surface is consistent with the prediction of the calculation, while the measured bandwidth is significantly narrower than the calculation. The discrepancy between the two suggests that the renormalization effect is significant due to the strong electron correlation in LSMO.
- Angle-resolved photoemission spectroscopy
- Band structure
- La Sr MnO thin film
- Laser MBE