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Naoto Metoki,Hironori Sakai,Yasunori Haga,Tatsuma D. Matsuda,Shugo Ikeda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic excitation of a narrow gap semiconductor β-US2 was studied by means of neutronscattering. At low temperatures, clear crystalline electric-field (CEF) excitations were observed,indicating the localized character of 5f electrons. The pseudo-doublet state at an excitation energyof 7 meV is consistent with the level scheme based on the 5f2 configuration of U4+ ions, whichreproduces the magnetic susceptibility, magnetization, and specific heat. At elevated temperatures,the conductivity recovers, with the excitation of 5f carriers being beyond the conduction gap of 90K. Simultaneously, the CEF excitation becomes weak and broad, and is replaced by a quasi-elasticresponse of magnetic origin, indicating a crossover of the 5f character from localized to itinerant.
Noriki Terada,Yoshinori Tsuchiya,Hideaki Kitazawa,Naoto Metoki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the magnetic and the nonmagnetic impurity substitution effects on themagnetic ordering of a frustrated isosceles-triangular-lattice antiferromagnet CuMnO2 by meansof magnetic neutron diffraction measurements on Cu(Mn1−yGay)O2. While the magnetic wavevector of the magnetic ground state of “magnetically”-substituted Cu(Mn1−xCux)O2 with x = 0.04is Q = (¯1212 0), that in the “nonmagnetically”-substituted Cu(Mn1−yGay)O2with y =0.05, 0.15and 0.20 is Q = (¯121212 ), which is identical to that of pure CuMnO2. We discuss the influence ofmagnetic or nonmagnetic impurity substitution on the magnetic ordering of CuMnO2, by comparingthe results for Cu(Mn1−yGay)O2with that for Cu(Mn1−xCux)O2.
Hiroyuki Kimura,K Kohn,K Kakurai,K Kaneko,N Metoki,S Wakimoto,Y Kamada,Y Noda 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
A microscopic magnetic phase diagram as functions of temperature and magnetic .eld was mapped for multiferroic compounds of RMn2O5 (R = Er, Ho) by using neutron diraction mea- surements under high magnetic .eld. The unambiguous relation between the ferroelectric phase transition and the magnetic phase transition from a two-dimensional incommensurate to a com- mensurate phase, where both the transitions are concomitantly induced by the magnetic .eld, indicates that the electric polarization is magnetically induced and the commensurate spin state is important for stabilizing the ferroelectricity in the multiferroic RMn2O5 system. The origin of the .eld-induced magnetic phase transition is discussed based on the magnetic structure. j_si
Hirshberg, Daniel,Sharon, Daniel,Afri, Michal,Lavi, Ronit,Frimer, Aryeh A.,Metoki, Noa,Eliaz, Noam,Kwak, Won-jin,Sun, Yang-Kook,Aurbach, Doron American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.13
<P>Using UV-vis spectroscopy in conjunction with various electrochemical techniques, we have developed a new effective operando methodology for investigating the oxygen reduction reactions (ORRs) and their mechanisms in nonaqueous solutions. We can follow the in situ formation and presence of superoxide moieties during ORR as a function of solvent, cations, anions, and additives in the solution. Thus, using operando UV-vis spectroscopy, we found evidence for the formation of superoxide radical anions during oxygen reduction in LiTFSI/diglyme electrolyte solutions. Nitro blue tetrazolium (NBT) was used to indicate the presence of superoxide moieties based on its unique spectral response. Indeed, the spectral response of NBT containing solutions undergoing ORR could provide a direct indication for the level of association of the Li cations with the electrolyte anions.</P> [FIG OMISSION]</BR>