Majority- and minority-spin α ( α maj and α min), folded majority- and minority-spin α ′ ( α maj ′ and α min ′), majority- and minority-spin β ( β maj and β min), and γ bands are shown with black dashed lines. Pseudocubic Brillouin zone is marked with white dashed lines. Each map is obtained by integrating over an energy window of ± 4 meV around the corresponding energy. (b) Constant energy maps at the Fermi level ( E F) (left) and binding energy of 40 meV (right) are measured by angle-resolved photoemission spectroscopy at 10 K.
Under finite magnetization ( M), α, β, and γ bands split into majority- (red) and minority-spin (blue) bands.
(a) Schematic Fermi surfaces of SRO thin films without folded bands. Our finding explains how ferromagnetism and electronic structure are connected, which has been under debate for decades in SRO.Įlectronic structures of SrRuO 3 thin films. Based on the ARPES study and theoretical calculation results, we found that SRO possesses spin-dependent electron correlations in which majority and minority spins are localized and itinerant, respectively. As temperature increases from low to the Curie temperature, spin-splitting gap decreases and band dispersions become incoherent. This experimental observation matches our dynamical mean-field theory results very well. The spin polarization is strongly dependent on momentum around the Fermi level, whereas it becomes less dependent at high-binding energies. Our high quality ARPES and SARPES results show clear spin-lifted band structures. We performed in situ angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES (SARPES) experiments to investigate the relationship between electronic band structures and ferromagnetism in SrRuO 3 (SRO) thin films.
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