H. J. Park
Seoul National University
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Publication
Featured researches published by H. J. Park.
Physical Review Letters | 2013
Da Woon Jeong; Hong Chul Choi; C. Kim; Seo Hyoung Chang; Changhee Sohn; H. J. Park; T. D. Kang; Deok-Yong Cho; Seung-Hyub Baek; Chang-Beom Eom; J. H. Shim; Jaejun Yu; K. W. Kim; Soon Jae Moon; T. W. Noh
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.
Physical Review B | 2014
H. J. Park; Changhee Sohn; Da Woon Jeong; G. Cao; K. W. Kim; S. J. Moon; Hosub Jin; Deok-Yong Cho; Tae Won Noh
We examined the temperature (T) evolution of the optical conductivity spectra of Sr
Physical Review Letters | 2015
Changhee Sohn; Hogyun Jeong; Hosub Jin; Soyeon Kim; Luke J. Sandilands; H. J. Park; K. W. Kim; S. J. Moon; Deok-Yong Cho; Jun-Ichi Yamaura; Zenji Hiroi; T. W. Noh
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Physical Review Letters | 2017
Changhee Sohn; C. Kim; Luke J. Sandilands; N. T. M. Hien; So Yeun Kim; H. J. Park; K. W. Kim; S. J. Moon; Jun-Ichi Yamaura; Zenji Hiroi; T. W. Noh
Ir
Physical Review B | 2014
Changhee Sohn; Min-Cheol Lee; H. J. Park; Kyung Joo Noh; Hyang Keun Yoo; S. J. Moon; K. W. Kim; Tongfei Qi; G. Cao; Deok-Yong Cho; T. W. Noh
_2
Physical Review B | 2013
Changhee Sohn; H.-S. Kim; Tongfei Qi; Dahee Jeong; H. J. Park; Hyang Keun Yoo; H. H. Kim; J.-Y. Kim; T. D. Kang; Deok-Yong Cho; G. Cao; Jaejun Yu; S. J. Moon; T. W. Noh
O
Physical Review Letters | 2017
Changhee Sohn; C. Kim; Luke J. Sandilands; N. T. M. Hien; So Yeun Kim; H. J. Park; K. W. Kim; S. J. Moon; Jun-Ichi Yamaura; Zenji Hiroi; T. W. Noh
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Physical Review B | 2017
H. J. Park; Byung Cheol Park; Min-Cheol Lee; Dahee Jeong; Joonbum Park; Jun Sung Kim; Hyo Seok Ji; Je-Ho Shim; K. W. Kim; S. J. Moon; Hyeong-Do Kim; Deok-Yong Cho; T. W. Noh
over a wide range of 10-400 K. The system was barely insulating, exhibiting a small indirect bandgap of
Bulletin of the American Physical Society | 2014
Deok-Yong Cho; H. J. Park; Chang Hee Sohn; Da Woon Jeong; G. Cao; Kyung Wan Kim; Soon Jae Moon; Tae Won Noh
\sim
Bulletin of the American Physical Society | 2014
Chang Hee Sohn; Tongfei Qi; Kyung Joo Noh; H. J. Park; Hyang Keun Yoo; G. Cao; Kyung Wan Kim; Deok-Yong Cho; Soon Jae Moon; Tae Won Noh
0.1 eV. The low-energy features of the optical d-d excitation (