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arXiv · 1309.0925

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·T. W. Noh
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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.

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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, T. W. Noh. 2013-09-04. Temperature Evolution of Itinerant Ferromagnetism in SrRuO3 Probed by Optical Spectroscopy. https://doi.org/10.1103/physrevlett.110.247202

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