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철원소를 함유한 분자기반 생체물질 나노입자들의 연 x선 방사광 분광 연구
이은숙(Eunsook Lee),김대현(D. H. Kim),황지훈(Jihoon Hwang),이기호(Kiho Lee),강정수(J.-S. Kang) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.4
By employing soft x-ray absorption spectroscopy (XAS) and soft x-ray magnetic circular dichroism (XMCD), the electronic structures of molecule-based nano bioparticles, such as Helicobacter pylori ferritin (H. pylori ferritin), Heme, NaM[Fe(CN)?] · H₂Otype Prussian Blue (M=Co, Ni) analogue, have been investigated. The measured Fe 2p XAS spectra reveal that Fe ions are trivalent (Fe<SUP>3+</SUP>) in H. pylori ferritins, while they are in the Fe<SUP>2+</SUP>-Fe<SUP>3+</SUP> mixed-valent states in NaM[Fe(CN)6] · H2O Prussian Blue analogues (M=Co, Ni). According to the Fe 2p XMCD spectrum of high-state H. pylori ferritin, all the Fe<SUP>3+</SUP> ions have the same local symmetry and their magnetic moments are aligned in the same direction. It is also found that the Fe 3d orbitals in NaM[Fe(CN)?] · H₂O have a strong covalent bonding to (CN)? ligands, but with a very weak bonding to the 2p orbitals of O ligands.
준이차원 전하밀도파 CeTe₂의 각분해 광전자 분광 연구
김대현(D. H. Kim),이현진,강정수(J.-S. Kang),김형도(H.-D. Kim),민병훈(B. H. Min),권용성(Y. S. Kwon),김준원(J. W. Kim),민병일(B. I. Min) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.5
The electronic structure of charge-density-wave (CDW) system CeTe₂ has been investigated by using angle-resolved photoemission spectroscopy (ARPES). The clearly dispersive band structures are observed in the measured ARPES spectra, indicating the good quality of the single-crystalline sample employed in this study. The four-fold symmetric patterns are observed in the constant energy (CE) mappings, indicating the 2 × 2 lattice deformation in the Te(1) sheets. The observed CE images are similar to those of LaTe2, suggesting that Ce 4f states have the minor contribution to the CDW formation in CeTe₂. This study reveals that the carriers near the Fermi level should have mainly the Te(1) 5p and Ce 5d character, that the Te(1) 5p bands contribute to the CDW formation, and that the Ce 5d bands cross the Fermi level even in the CDW state.