Observation of spin-dependent dual ferromagnetism in perovskite ruthenates

Abstract

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. Our high-quality ARPES and SARPES results show clear spin-lifted band structures. The spin polarization is strongly dependent on momentum around the Fermi level, whereas it becomes less dependent at high-binding energies. This experimental observation matches our dynamical mean-field theory (DMFT) results very well. As temperature increases from low to the Curie temperature, spin-splitting gap decreases and band dispersions become incoherent. 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. Our finding explains how ferromagnetism and electronic structure are connected, which has been under debate for decades in SRO.

6 pages, 4 figures

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Cited by in corpus (5)

• Materials challenges for SrRuO3: from conventional to quantum electronics
• Evolution of electronic band reconstruction in thickness-controlled perovskite SrRuO${}_3$ thin films
• Tunable electronic and magnetic phases in layered ruthenates: SrRuO3-SrTiO3 heterostructure upon strain
• Magnon dispersion in ferromagnetic SrRuO${}_3$
• Electric control of two-dimensional Van Hove singularity in oxide ultra-thin films