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Nontrivial Ferrimagnetism of the Heisenberg Model on the Union Jack Strip Lattice
Tokuro Shimokawa,Hiroki Nakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study the ground-state properties of the S = 1/2 antiferromagnetic Heisenberg model onthe Union Jack strip lattice by using the exact-diagonalization and density matrix renormalizationgroup methods. We confirm a region of a magnetization state intermediate between the N´eel-likespin liquid state and the conventional ferrimagnetic state of a Lieb-Mattis type. In the intermediatestate, we find that the spontaneous magnetization changes gradually with respect to the strength ofthe inner interaction. In addition, the local magnetization clearly shows an incommensurate modulationwith long-distance periodicity in the intermediate magnetization state. These characteristicbehaviors lead to the conclusion that the intermediate magnetization state is a non-Lieb-Mattisferrimagnetic one. We also discuss the relationship between the ground-state properties of theS = 1/2 antiferromagnetic Heisenberg model on the original Union Jack lattice and those on ourstrip lattice.
Studies on the characterization of sulfur and coloration in borosilicate glasses
Taro Asahi,Susumu Nakayama,Tokuro Nanba,Hajime Kiyono,Hiroshi Yamashita,Takashi Maekawa 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
Ternary alkali borosilicate glasses containing sulfur were prepared by a conventional melt quenching method, and their chemical bonding states were investigated based on XPS and 29Si,11B MAS-NMR measurement. The glass samples changed in color from blue to reddish brown due to the state of the sulfur and their glass compositions. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The forming of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, a signal from silicon atoms coordinated to the sulfur was detected in these glasses by the 29Si MAS-NMR measurement. From these results, it is considered that sulfur atoms bonded silicon atoms at the forming range of the non-bridging oxygen component. Ternary alkali borosilicate glasses containing sulfur were prepared by a conventional melt quenching method, and their chemical bonding states were investigated based on XPS and 29Si,11B MAS-NMR measurement. The glass samples changed in color from blue to reddish brown due to the state of the sulfur and their glass compositions. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The forming of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, a signal from silicon atoms coordinated to the sulfur was detected in these glasses by the 29Si MAS-NMR measurement. From these results, it is considered that sulfur atoms bonded silicon atoms at the forming range of the non-bridging oxygen component.
Chemical Bonding State of Sulfur in Oxysulfide Glasses
Asahi, Taro,Miura, Yoshinari,Nanba, Tokuro,Yamashita, Hiroshi The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.2
Simple binary $Na_2S-SiO_2$ oxysulfide glasses were prepared by a conventional melt-quench method in order to investigate the role of sulfur in glass structure and the electronic state. By X-ray photoelectron spectroscopy(XPS) measurement, S2p binding energy of the glass was observed at approximately 161eV which was close to that of ionic $S^{2-}$. The coordinating state around silicon atoms were investigated by ${29}^Si$ MAS-NMR measurement. The chemical shift observed from NMR supported that sulfur atom was joined to a silicon atom by substituting for an oxygen atom and was present as a non-bridging sulfide ion in low alkali content. On the other hand, it could be presumed that a portion of sulfur anions existed in an isolated state from the glass-network frame at high alkali content. The state of these sulfurs was also studied by Raman spectroscopy in detail.