T
Takatoshi Nomura
Researcher at Tokyo Institute of Technology
Publications - 21
Citations - 1125
Takatoshi Nomura is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Tetragonal crystal system & Superconductivity. The author has an hindex of 13, co-authored 21 publications receiving 1069 citations.
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Journal ArticleDOI
Crystallographic phase transition and high-Tc superconductivity in LaFeAsO:F
Takatoshi Nomura,Sung Wng Kim,Yoichi Kamihara,Masahiro Hirano,Peter V. Sushko,Kenichi Kato,Masaki Takata,Alexander L. Shluger,Hideo Hosono +8 more
TL;DR: In this article, the authors examined the crystal structures, magnetic properties and conductivity of undoped (normal conductor) and 14.5% F-doped LaFeAsO (Tc = 20?K) by synchrotron x-ray diffraction (XRD), DC magnetic measurements, and ab?initio calculations demonstrated that the anomaly is associated with a phase transition from tetragonal (P4/nmm) to orthorhombic (Cmma) phases at ~160?K as well as an antiferromagnetic spin ordering transition at
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Metallic state in a lime-alumina compound with nanoporous structure.
Sung Wng Kim,Satoru Matsuishi,Takatoshi Nomura,Yoshiki Kubota,Masaki Takata,Katsuro Hayashi,Toshio Kamiya,Masahiro Hirano,Hideo Hosono +8 more
TL;DR: A metallic state in a nanostructured porous crystal 12CaO x 7Al2O3 is reported by incorporating electrons in the inherent subnanometer-sized cages, in which a three-dimensionally closely packed cage structure acts as an electronic conduction path.
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Superconductivity induced by co-doping in quaternary fluoroarsenide CaFeAsF.
Satoru Matsuishi,Yasunori Inoue,Takatoshi Nomura,Hiroshi Yanagi,Masahiro Hirano,Hideo Hosono +5 more
TL;DR: The present results suggest that CaFeAsF is a promising candidate as a parent compound for high Tc superconductors.
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Electronic and magnetic phase diagram of superconductors, SmFeAsO1−xFx
Yoichi Kamihara,Takatoshi Nomura,Masahiro Hirano,Jungeun Kim,Kenichi Kato,Masaki Takata,Yasuhiro Kobayashi,Shinji Kitao,Satoshi Higashitaniguchi,Yoshitaka Yoda,Makoto Seto,Makoto Seto,Hideo Hosono +12 more
TL;DR: In this paper, a crystallographic and magnetic phase diagram of SmFeAsO1−xFx is determined as a function of x in terms of temperature based on electrical transport and magnetization, synchrotron powder x-ray diffraction, 57Fe Mossbauer spectra (MS), and 149Sm nuclear resonant forward scattering (NRFS) measurements.
Journal ArticleDOI
Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx
Yoichi Kamihara,Takatoshi Nomura,Masahiro Hirano,Jungeun Kim,Kenichi Kato,Masaki Takata,Yasuhiro Kobayashi,Shinji Kitao,Satoshi Higashitaniguchi,Yoshitaka Yoda,Makoto Seto,Hideo Hosono +11 more
TL;DR: In this paper, a crystallographic and magnetic phase diagram of SmFeAsO1-xFx is determined as a function of x in terms of temperature based on electrical transport and magnetization, synchrotron powder x-ray diffraction, 57Fe Mossbauer spectra (MS), and 149Sm nuclear resonant forward scattering (NRFS) measurements.