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Longitudinal Magnetoresistance of Ce(Cu1−xNix)2Si2
Yoichi Ikeda,Shingo Araki,Tatsuo C. Kobayashi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1−xNix)2Si2 samples is investigatedbetween T = 2 and 15 K up to H = 80 kOe. The application of magnetic field inducesanomalous temperature dependence of the resistivity with the power index n < 2 for x = 0.12and 0.14, in which ρ(T) obeys a T2-law at H = 0 Oe. A sign-change of the LMR from positive(x < 0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized(~ −4 % at T = 2 K) around x ~ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrationsimplies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondotemperature, respectively. Anomalous quantum fluctuations are probably developed around x ~ 0.10.
Takehito Nakano,Duong Thi Hanh,Akihiro Owaki,Yasuo Nozue,Nguyen Hoang Nam,Shingo Araki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Zeolite LSX (low-silica X) crystals have an aluminosilicate framework with regular supercagesand β-cages. They are arrayed in a double diamond structure. The loading density of guest Katoms per supercage (or β cage), n, can be controlled from 0 to ~ 9. At n < 2, samples are nearlynonmagnetic and insulating. The Curie constant has a clear peak at n = 3, and the electricalresistivity suddenly decreases simultaneously. The electrical resistivity suddenly decreases again atn = 6 and shows metallic phase at n > 6. These properties are explained by the polaron effectincluding the electron correlation. Ferrimagnetic properties are observed at n ~ 9. A remarkableincrease in the resistivity is observed at very low temperatures at n ~ 9, and is discussed in termsof the hypothesis of a Kondo insulator.
( Taku Kobayashi ),( Tadakazu Hisamatsu ),( Yasuo Suzuki ),( Haruhiko Ogata ),( Akira Andoh ),( Toshimitsu Araki ),( Ryota Hokari ),( Hideki Iijima ),( Hiroki Ikeuchi ),( Yoh Ishiguro ),( Shingo Kato 대한장연구학회 2018 Intestinal Research Vol.16 No.2
Inflammatory bowel disease (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), is a chronic inflammatory disease of the gastrointestinal tract, with increasing prevalence worldwide. IBD Ahead is an international educational program that aims to explore questions commonly raised by clinicians about various areas of IBD care and to consolidate available published evidence and expert opinion into a consensus for the optimization of IBD management. Given differences in the epidemiology, clinical and genetic characteristics, management, and prognosis of IBD between patients in Japan and the rest of the world, this statement was formulated as the result of literature reviews and discussions among Japanese experts as part of the IBD Ahead program to consolidate statements of factors for disease prognosis in IBD. Evidence levels were assigned to summary statements in the following categories: disease progression in CD and UC; surgery, hospitalization, intestinal failure, and permanent stoma in CD; acute severe UC; colectomy in UC; and colorectal carcinoma and dysplasia in IBD. The goal is that this statement can aid in the optimization of the treatment strategy for Japanese patients with IBD and help identify high-risk patients that require early intervention, to provide a better long-term prognosis in these patients. (Intest Res 2018;16:168-177)
Exotic Magnetism of s-electron Cluster Arrays: Ferromagnetism, Ferrimagnetism and Antiferromagnetism
Takehito Nakano,Duong Thi Hanh,Yasuo Nozue,Nguyen Hoang Nam,Truong Cong Duan,Shingo Araki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Alkali metal nanoclusters can be stabilized in the regular cages of zeolite crystals by the loading ofguest alkali metals. Cages are connected by the sharing of windows of the framework, and arrayed insimple cubic, diamond and body centered cubic structures in zeolites A, X and sodalite, respectively. The s-electrons have the localized nature of nanoclusters with magnetic moments, and have mutualinteractions through the windows of cages. They show exotic magnetism depending on the structuretype of zeolites, the kind of alkali metals and the average loading density of alkali atoms per cage. In zeolite A, potassium clusters are formed in α-cages that have an inside diameter of 11 °A. Theyexhibit ferromagnetic properties explained by the canted antiferromagnetism of the Mott insulator,where the 1p-like degenerate orbitals of clusters play an essential role in the magnetic properties. Na-K alloy clusters generated at supercages and β-cages of low-silica X (LSX) zeolite exhibit N´eel’sN-type ferrimagnetism at specific loading densities of alkali metals. Alkali metal clusters in sodaliteshow the ideal Heisenberg antiferromagnetism of the Mott insulator.