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Observation of Spin-Dependent Dual Ferromagnetism in Perovskite Ruthenates

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Title
Observation of Spin-Dependent Dual Ferromagnetism in Perovskite Ruthenates
Author(s)
Sungsoo Hahn; Byungmin Sohn; Kim, Minjae; Jeong Rae Kim; Soonsang Huh; Younsik Kim; Wonshik Kyung; Minsoo Kim; Donghan Kim; Youngdo Kim; Tae Won Noh; Shim, Ji Hoon; Changyoung Kim
Publication Date
2021-12-15
Journal
Physical Review Letters, v.127, no.25
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.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 SrRuO3 (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 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.
URI
https://pr.ibs.re.kr/handle/8788114/11096
DOI
10.1103/PhysRevLett.127.256401
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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