Temperature Evolution of Itinerant Ferromagnetism in SrRuO3 Probed by Optical Spectroscopy

D. W. Jeong, Hong Chul Choi, Choong H. Kim, Seo Hyoung Chang, C. H. Sohn, H. J. Park, T. D. Kang, Deok-Yong Cho, S. H. Baek, C. B. Eom, J. H. Shim, J. Yu, K. W. Kim, S. J. Moon, and T. W. Noh
Phys. Rev. Lett. 110, 247202 – Published 11 June 2013
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Abstract

The temperature (T) dependence of the optical conductivity spectra σ(ω) of a single crystal SrRuO3 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 dd transitions across the ferromagnetic Curie temperature (Tc150K). 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 T2 dependence below Tc, 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 Tc, indicating that the local spin moment persists in the paramagnetic state. This suggests that SrRuO3 is an intriguing oxide system with itinerant ferromagnetism.

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  • Received 11 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.247202

© 2013 American Physical Society

Authors & Affiliations

D. W. Jeong1,2, Hong Chul Choi3, Choong H. Kim2, Seo Hyoung Chang1,2, C. H. Sohn1,2, H. J. Park1,2, T. D. Kang1,2, Deok-Yong Cho1,2, S. H. Baek4, C. B. Eom4, J. H. Shim3,5, J. Yu2, K. W. Kim6, S. J. Moon7,*, and T. W. Noh1,2,†

  • 1Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea
  • 2Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  • 3Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 4Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 5Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 6Department of Physics, Chungbuk National University, Cheongju 361-763, Korea
  • 7Department of Physics, Hanyang University, Seoul 133-791, Korea

  • *soonjmoon@hanyang.ac.kr
  • twnoh@snu.ac.kr

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Vol. 110, Iss. 24 — 14 June 2013

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