Myung Whun Kim
Seoul National University
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Publication
Featured researches published by Myung Whun Kim.
New Journal of Physics | 2004
Myung Whun Kim; P. Murugavel; Sachin Parashar; J S Lee; Tae Won Noh
We investigated the temperature-dependent optical absorption spectra of LaMnO3 and NdMnO3 epitaxial thin films. We found that both spectra have strong absorption features around 2 eV, and that the 2 eV peak of LaMnO3 has a weak temperature dependence. As the La ions are replaced with Nd ions, the spectral weight of the peak becomes suppressed. From careful comparisons with the orbitally degenerate Hubbard model, we could explain most of the spectral features of the 2 eV peak observed in the absorption spectra. We also found a fine structure of three sub-peaks in the 2 eV peak, whose origin was considered based on currently available ideas.
Physica C-superconductivity and Its Applications | 2001
Hosik Lee; Joohyun Jung; Kee Hoon Kim; Myung Whun Kim; T. W. Noh; Yutaka Moritomo; Y.J Wang; X Wei
Abstract We investigated magnetic-field-dependent optical conductivity spectra σ ( ω ) of Pr 0.69 Ca 0.31 MnO 3 at 4.2 K, which was in a charge-ordered insulating state at 0 T. With increasing the magnetic field up to 12 T, we observed an insulator–metal transition around 4 T and large spectral weight changes up to 4 eV. Especially, we found that the spectral weight above 0.5 eV moved to a lower energy region and that a Drude-like peak appeared clearly at 12 T. By analyzing dielectric response changes, we suggested that the field-dependent insulator–metal transition might occur through a percolation process of ferromagnetic metal domains. On the other hand, with decreasing the magnetic field from 12 to 0 T, σ ( ω ) showed little changes, which showed that the ferromagnetic metallic state did not return to the insulating state.
Physical Review Letters | 2006
Myung Whun Kim; Stephen John Moon; J. H. Jung; Jaejun Yu; Sachin Parashar; P. Murugavel; J. H. Lee; T. W. Noh
Archive | 2007
Stephen John Moon; Juneyoung Lee; Myung Whun Kim; Tae Won Noh; Hosub Jin; Baek Kim; Jaejun Yu; Seung Jae Oh; Jane Park; Charles Kim; G. Cao
arXiv: Strongly Correlated Electrons | 2006
Myung Whun Kim; Hak Jong Lee; B. J. Yang; Kee Hoon Kim; Yutaka Moritomo; Jaejun Yu; T. W. Noh
arXiv: Strongly Correlated Electrons | 2005
Myung Whun Kim; Stephen John Moon; Jae Ho Jung; Jaejun Yu; Sachin Parashar; P. Murugavel; T. W. Noh
Archive | 2005
Myung Whun Kim; Stephen John Moon; Jae Ho Jung; Jaejun Yu; Sachin Parashar; P. Murugavel; Tae Won Noh
Archive | 2003
Sung Seok A. Seo; Myung Whun Kim; Duck-Hyun Kim; Tae Won Noh; Young Lee; Yong Dae Park; G. T. Thaler; M. E. Overberg; C. R. Abernathy; Stephen J. Pearton
Archive | 2003
Myung Whun Kim; Young Lee; Tae Won Noh; Yutaka Moritomo
Archive | 2003
H. J. Lee; Myung Whun Kim; Tae Won Noh; Yutaka Moritomo