T
Takumi Watanabe
Researcher at Sophia University
Publications - 15
Citations - 7574
Takumi Watanabe is an academic researcher from Sophia University. The author has contributed to research in topics: Superconductivity & Paramagnetism. The author has an hindex of 7, co-authored 15 publications receiving 7075 citations. Previous affiliations of Takumi Watanabe include Tokyo Institute of Technology.
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Journal ArticleDOI
Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K
TL;DR: It is reported that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site and exhibits a trapezoid shape dependence on the F- content.
Journal ArticleDOI
Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05—0.12) with Tc = 26 K.
TL;DR: In this paper, a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site, and the transition temperature exhibits a trapezoid shape dependence on the F- content, with the highest Tc of ∼26 K at ∼11 atom %.
Journal ArticleDOI
Nickel-based oxyphosphide superconductor with a layered crystal structure, LaNiOP.
Takumi Watanabe,Hiroshi Yanagi,Toshio Kamiya,Yoichi Kamihara,Hidenori Hiramatsu,Masahiro Hirano,Hideo Hosono +6 more
TL;DR: The volume fraction of the superconducting phase estimated from the diamagnetic susceptibility reached approximately 40 vol % at 1.8 K, substantiating that LaNiOP is a bulk superconductor.
Journal ArticleDOI
Nickel-based layered superconductor, LaNiOAs
TL;DR: Rietveld analysis of the powder X-ray diffraction of a new layered oxyarsenide, LaNiOAs, which was synthesized by solid-state reactions, revealed that it belongs to the tetragonal ZrCuSiAs-type structure and is composed of alternating stacks of La-O and Ni-As layers.
Journal ArticleDOI
Antiferromagnetic bipolar semiconductor LaMnPO with ZrCuSiAs-type structure
Hiroshi Yanagi,Takumi Watanabe,Katsuaki Kodama,Satoshi Iikubo,Satoshi Iikubo,Shin-ichi Shamoto,Toshio Kamiya,Masahiro Hirano,Hideo Hosono +8 more
TL;DR: In this paper, the electronic and magnetic properties of a layered compound LaMnPO are examined in relation to a newly discovered iso-structural superconductor LaFeAs(P)O.