title: Temperature evolution of itinerant ferromagnetism in SrRuO3 probed by optical spectroscopy.
abstract: The temperature (T) dependence of the optical conductivity spectra σ(ω) of a single crystal SrRuO(3) thin film is studied over a T range from 5 to 450 K. We observed significant T dependence of the spectral weights of the charge transfer and interband d-d transitions across the ferromagnetic Curie temperature (T(c) ∼ 150 K). Such T dependence was attributed to the increase in the Ru spin moment, which is consistent with the results of density functional theory calculations. T scans of σ(Ω,T) at fixed frequencies Ω reveal a clear T(2) dependence below T(c), demonstrating that the Stoner mechanism is involved in the evolution of the electronic structure. In addition, σ(Ω,T) continues to evolve at temperatures above T(c), indicating that the local spin moment persists in the paramagnetic state. This suggests that SrRuO(3) is an intriguing oxide system with itinerant ferromagnetism.
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: D W
authors.initials: DW
authors.lastname: Jeong
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Hong Chul
authors.initials: HC
authors.lastname: Choi
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: Choong H
authors.initials: CH
authors.lastname: Kim
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: Seo Hyoung
authors.initials: SH
authors.lastname: Chang
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Sohn
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: H J
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: T D
authors.initials: TD
authors.lastname: Kang
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: Deok-Yong
authors.initials: DY
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: S H
authors.initials: SH
authors.lastname: Baek
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Eom
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Shim
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Yu
authors.affiliation: Department of Physics, Chungbuk National University, Cheongju 361-763, Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Department of Physics, Hanyang University, Seoul 133-791, Korea.
authors.forename: S J
authors.initials: SJ
authors.lastname: Moon
authors.affiliation: Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: T W
authors.initials: TW
authors.lastname: Noh