Y
Y. Ueda
Researcher at University of Tokyo
Publications - 229
Citations - 5086
Y. Ueda is an academic researcher from University of Tokyo. The author has contributed to research in topics: Phase transition & Charge ordering. The author has an hindex of 34, co-authored 228 publications receiving 4810 citations.
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Journal ArticleDOI
Exact Dimer Ground State and Quantized Magnetization Plateaus in the Two-Dimensional Spin System SrCu 2 ( BO 3 ) 2
Hiroshi Kageyama,Hiroshi Kageyama,K. Yoshimura,K. Yoshimura,Raivo Stern,N.V. Mushnikov,K. Onizuka,Masako Kato,K. Kosuge,Charles P. Slichter,T. Goto,Y. Ueda +11 more
TL;DR: In this paper, a 2D spin-gap system for polycrystalline Cu dimers with a two-dimensional (2D) orthogonal network of dimers was proposed.
Journal ArticleDOI
Oxygen Nonstoichiometry, Structures, and Physical Properties of YBaCo2O5+x (0.00≤x≤0.52)
D. Akahoshi,Y. Ueda +1 more
TL;DR: In this paper, the authors synthesized BaCo2O5+x with various oxygen contents and investigated physical and structural properties, which can be classified into three parts of composition region in the structural properties.
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Direct evidence for the localized single-triplet excitations and the dispersive multitriplet excitations in SrCu2(BO3)2.
Hiroshi Kageyama,Masakazu Nishi,Naofumi Aso,K Onizuka,T Yosihama,Katsuyuki Nukui,Katsuaki Kodama,Kazuhisa Kakurai,Y. Ueda +8 more
TL;DR: Inelastic neutron scattering on the 2D Shastry-Sutherland system SrCu2(11BO3)2 with an exact dimer ground state shows a significant constraint on a single-triplet hopping owing to the orthogonality of the neighboring dimers.
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Pressure-induced superconductivity in beta- Na (0.33) V(2)O(5) beyond charge ordering.
TL;DR: In this paper, a new superconducting phase in highly correlated 3D electron systems was discovered, in which the charge-ordered phase collapsed under hydrostatic high pressure and a pressure-induced superconducted phase appeared around T(S C)=8 K, P=8 GPa.
Journal ArticleDOI
A revisit of photoluminescence property for vanadate oxides AVO3 (A:K, Rb and Cs) and M3V2O8 (M:Mg and Zn)
TL;DR: In this article, the authors revisited the vanadium oxide phosphors, AVO 3 (A:K, Rb, and Cs) and M 3 V 2 O 8(A:Mg and Zn) for a revaluation of possibility of these compounds for lighting applications, and the internal quantum efficiency and luminescent colour properties for AVO3 and M3 V 2O 8 have been presented.