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Kang, J.-S.,Kim, G.,Lee, H. J.,Kolesnik, S.,Dabrowski, B.,Lee, Hangil,Kim, J.-Y.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>The electronic structure of ferromagnetic double-perovskite La2MnNiO6 has been investigated by employing Mn and Ni 2p -> 3d resonant photoemission spectroscopy (RPES) and soft x-ray absorption spectroscopy (XAS). The Mn and Ni 2p XAS measurements show that Mn ions are formally tetravalent (3d(3)) and that Ni ions are formally divalent (3d(8)). Mn and Ni 2p -> 3d RPES shows that the occupied Mn 3d(3) (t(2g)(3)up arrow) states are sharp and located around 2 eV below E-F, while the occupied Ni 3d(8) (t(2g)(3)up arrow t(2g)(3)up arrow e(g)(2)up arrow) states are broader than the Mn 3d states and they extend from E-F to similar to 5 eV below E-F. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073663]</P>
Valence and spin states, and the metal-insulator transition in ferromagneticLa2−xSrxMnNiO6(x=0,0.2)
Kang, J.-S.,Lee, H. J.,Kim, D. H.,Kolesnik, S.,Dabrowski, B.,Ś,wierczek, K.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Physical Society 2009 Physical review. B, Condensed matter and materials Vol.80 No.4
A.A. KONCHITS,F.V. MOTSNYI,S.P. KOLESNIK,E. TAMBURRI,S. ORLANDUCCI,D. PASSERI,M. ROSSI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.3
Poly(ortho-anisidine) (POA)/single walled carbon nanotubes (SWCNTs) composite films have been prepared by means of oxidative potentiostatic electropolymerization of the monomer (ortho-anisidine) in the presence of purified SWCNTs. The magnetic properties of the obtained films have been investigated by electron spin resonance (ESR) (9.4 GHz; temperature range 10-300 K) and compared with those of pure POA films in the same oxidation state. The similarity of the ESR signals and the dependence on temperature of the ESR line features suggest a polaron origin of the paramagnetic states. A strong increase of the ESR integral intensity has been detected for composite samples kept for 72 h in hydrogen atmosphere at room temperature. Under the same conditions, a less pronounced increase of the intensity has been detected in the case of pure polymer films. The kinetics of the hydrogen adsorption - desorption processes in the nanocomposite samples has been investigated and interpreted in the frame of an H-physisorption mechanism. The comparison between the H-induced effects in POA and nanocomposite POA/SWCNTS films has been carried out taking into account the structure of the samples and the presence of defects.
Soft x-ray absorption spectroscopy study of Mo-rich SrMn1−xMoxO3(x⩾0.5)
Hwang, J. H.,Kim, D. H.,Kang, J.-S.,Kolesnik, S.,Chmaissem, O.,Mais, J.,Dabrowski, B.,Baik, J.,Shin, H. J.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.83 No.7