1
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He X, Kimura S, Katase T, Tadano T, Matsuishi S, Minohara M, Hiramatsu H, Kumigashira H, Hosono H, Kamiya T. Inverse-Perovskite Ba 3 BO (B = Si and Ge) as a High Performance Environmentally Benign Thermoelectric Material with Low Lattice Thermal Conductivity. Adv Sci (Weinh) 2024; 11:e2307058. [PMID: 38145354 PMCID: PMC10933667 DOI: 10.1002/advs.202307058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/19/2023] [Indexed: 12/26/2023]
Abstract
High energy-conversion efficiency (ZT) of thermoelectric materials has been achieved in heavy metal chalcogenides, but the use of toxic Pb or Te is an obstacle for wide applications of thermoelectricity. Here, high ZT is demonstrated in toxic-element free Ba3 BO (B = Si and Ge) with inverse-perovskite structure. The negatively charged B ion contributes to hole transport with long carrier life time, and their highly dispersive bands with multiple valley degeneracy realize both high p-type electronic conductivity and high Seebeck coefficient, resulting in high power factor (PF). In addition, extremely low lattice thermal conductivities (κlat ) 1.0-0.4 W m-1 K-1 at T = 300-600 K are observed in Ba3 BO. Highly distorted O-Ba6 octahedral framework with weak ionic bonds between Ba with large mass and O provides low phonon velocities and strong phonon scattering in Ba3 BO. As a consequence of high PF and low κlat , Ba3 SiO (Ba3 GeO) exhibits rather high ZT = 0.16-0.84 (0.35-0.65) at T = 300-623 K (300-523 K). Finally, based on first-principles carrier and phonon transport calculations, maximum ZT is predicted to be 2.14 for Ba3 SiO and 1.21 for Ba3 GeO at T = 600 K by optimizing hole concentration. Present results propose that inverse-perovskites would be a new platform of environmentally-benign high-ZT thermoelectric materials.
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Affiliation(s)
- Xinyi He
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
| | - Shigeru Kimura
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
| | - Takayoshi Katase
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
| | - Terumasa Tadano
- Research Center for Magnetic and Spintronic MaterialsNational Institute for Materials Science1‐2‐1 SengenTsukubaIbaraki305‐0047Japan
| | - Satoru Matsuishi
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
- Research Center for Materials NanoarchitectonicsNational Institute for Materials Science1‐1 NamikiTsukuba, Ibaraki305‐0044Japan
| | - Makoto Minohara
- Research Institute for Advanced Electronics and PhotonicsNational Institute of Advanced Industrial Science and TechnologyTsukubaIbaraki305‐8568Japan
| | - Hidenori Hiramatsu
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
- Laboratory for Materials and StructuresInstitute of Innovative Research, Tokyo Institute of Technology4259 NagatsutaMidori, Yokohama226‐8501Japan
| | - Hiroshi Kumigashira
- Institute of Multidisciplinary Research for Advanced MaterialsTohoku UniversitySendai980‐8577Japan
| | - Hideo Hosono
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
- Research Center for Materials NanoarchitectonicsNational Institute for Materials Science1‐1 NamikiTsukuba, Ibaraki305‐0044Japan
| | - Toshio Kamiya
- MDX Research Center for Element StrategyInternational Research Frontiers InitiativeTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8501Japan
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2
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Yamasaki T, Takaoka R, Iimura S, Kim J, Hiramatsu H, Hosono H. Characteristic Resistive Switching of Rare-Earth Oxyhydrides by Hydride Ion Insertion and Extraction. ACS Appl Mater Interfaces 2022; 14:19766-19773. [PMID: 35438497 DOI: 10.1021/acsami.2c03483] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Resistive switching induced by ion migration is promising for applications such as random-access memory (ReRAM) and neuromorphic transistors. Hydride ions (H-) are an interesting candidate as the migration ion for resistive switching devices because they have fast diffusion in several compounds at room temperature and doping/dedoping can be used effectively to achieve significant changes in the electronic conductivity. Here, we report reversible resistive switching characteristics in rare-earth oxyhydrides (REHxO(3-x)/2) induced by field insertion/extraction of H-. The current-voltage measurements revealed that the resistive switching response, hysteresis, and switching voltage vary greatly with the H-/O2- ratio in the films. We fabricated a ReRAM device using Ti/YH1.3O0.85/MoOx structure and confirmed the bipolar-type operation with the resistance switching ratio of 1 order of magnitude over 1000 cycles. The composition gradient of H-/O2- in YHxO(3-x)/2 films, in addition to the hydrogen-absorbing ability of the top electrode, is essential for effective device operation. Our findings show that hydride-conducting solid-state electrolytes are suitable for resistive switching device development.
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Affiliation(s)
- Tomoyuki Yamasaki
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Ryosei Takaoka
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Soshi Iimura
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-004, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Junghwan Kim
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-004, Japan
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3
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He X, Zhang H, Nose T, Katase T, Tadano T, Ide K, Ueda S, Hiramatsu H, Hosono H, Kamiya T. Degenerated Hole Doping and Ultra-Low Lattice Thermal Conductivity in Polycrystalline SnSe by Nonequilibrium Isovalent Te Substitution. Adv Sci (Weinh) 2022; 9:e2105958. [PMID: 35257520 PMCID: PMC9069380 DOI: 10.1002/advs.202105958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/16/2022] [Indexed: 06/14/2023]
Abstract
Tin mono-selenide (SnSe) exhibits the world record of thermoelectric conversion efficiency ZT in the single crystal form, but the performance of polycrystalline SnSe is restricted by low electronic conductivity (σ) and high thermal conductivity (κ), compared to those of the single crystal. Here an effective strategy to achieve high σ and low κ simultaneously is reported on p-type polycrystalline SnSe with isovalent Te ion substitution. The nonequilibrium Sn(Se1- x Tex ) solid solution bulks with x up to 0.4 are synthesized by the two-step process composed of high-temperature solid-state reaction and rapid thermal quenching. The Te ion substitution in SnSe realizes high σ due to the 103 -times increase in hole carrier concentration and effectively reduced lattice κ less than one-third at room temperature. The large-size Te ion in Sn(Se1- x Tex ) forms weak SnTe bonds, leading to the high-density formation of hole-donating Sn vacancies and the reduced phonon frequency and enhanced phonon scattering. This result-doping of large-size ions beyond the equilibrium limit-proposes a new idea for carrier doping and controlling thermal properties to enhance the ZT of polycrystalline SnSe.
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Affiliation(s)
- Xinyi He
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Haoyun Zhang
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Takumi Nose
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Takayoshi Katase
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Terumasa Tadano
- Research Center for Magnetic and Spintronic MaterialsNational Institute for Materials Science1‐2‐1 SengenTsukubaIbaraki305‐0047Japan
| | - Keisuke Ide
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Shigenori Ueda
- Research Center for Functional MaterialsNational Institute for Materials ScienceNamikiTsukuba305‐0044Japan
- Research Center for Advanced Measurement and CharacterizationNational Institute for Materials ScienceTsukuba305‐0047Japan
- Synchrotron X‐ray Station at SPring‐8National Institute for Materials Science1‐1‐1 SayoHyogo679‐5148Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Hideo Hosono
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative ResearchTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, MidoriYokohama226‐8503Japan
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4
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He X, Chen J, Katase T, Minohara M, Ide K, Hiramatsu H, Kumigashira H, Hosono H, Kamiya T. High-Mobility Metastable Rock-Salt Type (Sn,Ca)Se Thin Film Stabilized by Direct Epitaxial Growth on a YSZ (111) Single-Crystal Substrate. ACS Appl Mater Interfaces 2022; 14:18682-18689. [PMID: 35420024 DOI: 10.1021/acsami.2c01464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Metastable cubic (Sn1-xPbx)Se with x ≥ 0.5 is expected to be a high mobility semiconductor due to its Dirac-like electronic state, but it has an excessively high carrier concentration of ∼1019 cm-3 and is not suitable for semiconductor device applications such as thin film transistors and solar cells. Further, thin films of (Sn1-xPbx)Se require a complicated synthesis process because of the high vapor pressure of Pb. We herein report the direct growth of metastable cubic (Sn1-xCax)Se films alloyed with CaSe, which has a wider bandgap and lower vapor pressure than PbSe. The cubic (Sn1-xCax)Se epitaxial films with x = 0.4-0.8 are stabilized on YSZ (111) single crystalline substrates by pulsed laser deposition. (Sn1-xCax)Se has a direct-transition-type bandgap, and the bandgap energy can be varied from 1.4 eV (x = 0.4) to 2.0 eV (x = 0.8) by changing x. These films with x = 0.4-0.6 show p-type conduction with low hole carrier concentrations of ∼1017 cm-3. Hall mobility analysis suggests that the hole transport would be dominated by 180° rotational domain structures, which is specific to (111) oriented epitaxial films. However, it, in turn, clarifies that the in-grain carrier mobility in the (Sn0.6Ca0.4)Se film is as high as 322 cm2/(Vs), which is much higher than those in thermodynamically stable layered SnSe and other Sn-based layered semiconductor films at room temperature. Therefore, the present results prove the potential of high mobility (Sn1-xCax)Se films for semiconductor device applications via a simple thin-film deposition process.
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Affiliation(s)
- Xinyi He
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Jinshuai Chen
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Takayoshi Katase
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Makoto Minohara
- Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - Keisuke Ide
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Hiroshi Kumigashira
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
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5
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Shiraishi A, Kimura S, He X, Watanabe N, Katase T, Ide K, Minohara M, Matsuzaki K, Hiramatsu H, Kumigashira H, Hosono H, Kamiya T. Design, Synthesis, and Optoelectronic Properties of the High-Purity Phase in Layered AETMN 2 ( AE = Sr, Ba; TM = Ti, Zr, Hf) Semiconductors. Inorg Chem 2022; 61:6650-6659. [PMID: 35442660 DOI: 10.1021/acs.inorgchem.2c00604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the synthesis and optoelectronic properties of high phase-purity (>94 mol %) bulk polycrystals of KCoO2-type layered nitrides AETMN2 (AE = Sr, Ba; and TM = Ti, Zr, Hf), which are expected to exhibit unique electron transport properties originating from their natural two-dimensional (2D) electronic structure, but high-purity intrinsic samples have yet been reported. The bulks were synthesized using a solid-state reaction between AENH and TMN precursors with NaN3 to achieve high N chemical potential during the reaction. The AETMN2 bulks are n-type semiconductors with optical band gaps of 1.63 eV for SrTiN2, 1.97 eV for BaZrN2, and 2.17 eV for BaHfN2. SrTiN2 and BaZrN2 bulks show degenerated electron conduction due to the natural high-density electron doping and paramagnetic behavior in all of the temperature ranges examined, while such unintentional carrier generation is largely suppressed in BaHfN2, which exhibits nondegenerated electron conduction. The BaHfN2 sample also exhibits weak ferromagnetic behavior at temperatures lower than 35 K. Density functional theory calculations suggest that the high-density electron carriers in SrTiN2 come from oxygen impurity substitution at the N site (ON) acting as a shallow donor even if the high-N chemical potential synthesis conditions are employed. On the other hand, the formation energy of ON becomes larger in BaHfN2 because of the stronger TM-N chemical bonds. Present results demonstrate that the easiness of impurity incorporation is designed by density functional calculations to produce a more intrinsic semiconductor in wider chemical conditions, opening a way to cultivating novel functional materials that are sensitive to atmospheric impurities and defects.
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Affiliation(s)
- Akihiro Shiraishi
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Shigeru Kimura
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Xinyi He
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Naoto Watanabe
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Takayoshi Katase
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Keisuke Ide
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Makoto Minohara
- Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - Kosuke Matsuzaki
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hiroshi Kumigashira
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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6
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Katase T, He X, Tadano T, Tomczak JM, Onozato T, Ide K, Feng B, Tohei T, Hiramatsu H, Ohta H, Ikuhara Y, Hosono H, Kamiya T. Breaking of Thermopower-Conductivity Trade-Off in LaTiO 3 Film around Mott Insulator to Metal Transition. Adv Sci (Weinh) 2021; 8:e2102097. [PMID: 34672114 PMCID: PMC8655177 DOI: 10.1002/advs.202102097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/13/2021] [Indexed: 06/13/2023]
Abstract
Introducing artificial strain in epitaxial thin films is an effective strategy to alter electronic structures of transition metal oxides (TMOs) and to induce novel phenomena and functionalities not realized in bulk crystals. This study reports a breaking of the conventional trade-off relation in thermopower (S)-conductivity (σ) and demonstrates a 2 orders of magnitude enhancement of power factor (PF) in compressively strained LaTiO3 (LTO) films. By varying substrates and reducing film thickness down to 4 nm, the out-of-plane to the in-plane lattice parameter ratio is controlled from 0.992 (tensile strain) to 1.034 (compressive strain). This tuning induces the electronic structure change from a Mott insulator to a metal and leads to a 103 -fold increase in σ up to 2920 S cm-1 . Concomitantly, the sign of S inverts from positive to negative, and both σ and S increase and break the trade-off relation between them in the n-type region. As a result, the PF (=S2 σ) is significantly enhanced to 300 µW m- 1 K-2 , which is 102 times larger than that of bulk LTO. Present results propose epitaxial strain as a means to finely tune strongly correlated TMOs close to their Mott transition, and thus to harness the hidden large thermoelectric PF.
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Affiliation(s)
- Takayoshi Katase
- Laboratory for Materials and StructuresTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
- PRESTOJapan Science and Technology Agency7 GobanchoChiyoda‐kuTokyo102‐0076Japan
| | - Xinyi He
- Laboratory for Materials and StructuresTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
| | - Terumasa Tadano
- Research Center for Magnetic and Spintronic MaterialsNational Institute for Materials Science1‐2‐1 SengenTsukubaIbaraki305‐0047Japan
| | - Jan M. Tomczak
- Institute of Solid State PhysicsVienna University of TechnologyWiedner Hautptstrasse 8‐10, A‐1040 ViennaAustria
| | - Takaki Onozato
- Graduate School of Information Science and TechnologyHokkaido UniversityN14W9, Kita‐kuSapporo060‐0814Japan
| | - Keisuke Ide
- Laboratory for Materials and StructuresTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
| | - Bin Feng
- Institute of Engineering InnovationThe University of Tokyo2‐11‐16 Yayoi, Bunkyo‐kuTokyo113‐8656Japan
| | - Tetsuya Tohei
- Graduate School of Engineering ScienceOsaka University1‐3 Machikaneyama‐choToyonakaOsaka560‐8531Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and StructuresTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
| | - Hiromichi Ohta
- Research Institute for Electronic ScienceHokkaido UniversityN20W10, Kita‐kuSapporo001‐0020Japan
| | - Yuichi Ikuhara
- Institute of Engineering InnovationThe University of Tokyo2‐11‐16 Yayoi, Bunkyo‐kuTokyo113‐8656Japan
| | - Hideo Hosono
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
| | - Toshio Kamiya
- Laboratory for Materials and StructuresTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
- Materials Research Center for Element StrategyTokyo Institute of Technology4259 Nagatsuta, Midori‐kuYokohama226‐8503Japan
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7
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Kimura M, He X, Katase T, Tadano T, Tomczak JM, Minohara M, Aso R, Yoshida H, Ide K, Ueda S, Hiramatsu H, Kumigashira H, Hosono H, Kamiya T. Large phonon drag thermopower boosted by massive electrons and phonon leaking in LaAlO 3/LaNiO 3/LaAlO 3 heterostructure. Nano Lett 2021; 21:9240-9246. [PMID: 34709840 PMCID: PMC8587880 DOI: 10.1021/acs.nanolett.1c03143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/11/2021] [Indexed: 06/04/2023]
Abstract
An unusually large thermopower (S) enhancement is induced by heterostructuring thin films of the strongly correlated electron oxide LaNiO3. The phonon-drag effect, which is not observed in bulk LaNiO3, enhances S for thin films compressively strained by LaAlO3 substrates. By a reduction in the layer thickness down to three unit cells and subsequent LaAlO3 surface termination, a 10 times S enhancement over the bulk value is observed due to large phonon drag S (Sg), and the Sg contribution to the total S occurs over a much wider temperature range up to 220 K. The Sg enhancement originates from the coupling of lattice vibration to the d electrons with large effective mass in the compressively strained ultrathin LaNiO3, and the electron-phonon interaction is largely enhanced by the phonon leakage from the LaAlO3 substrate and the capping layer. The transition-metal oxide heterostructures emerge as a new playground to manipulate electronic and phononic properties in the quest for high-performance thermoelectrics.
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Affiliation(s)
- Masatoshi Kimura
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Xinyi He
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Takayoshi Katase
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
- PRESTO,
Japan Science and Technology Agency, 7 Gobancho, Chiyoda, Tokyo 102-0076, Japan
| | - Terumasa Tadano
- National
Institute for Materials Science, Sengen, Tsukuba 305-0047, Japan
| | - Jan M. Tomczak
- Institute
of Solid State Physics, Vienna University
of Technology, Wiedner Hauptstrasse 8-10, A-1040 Vienna, Austria
| | - Makoto Minohara
- Research
Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - Ryotaro Aso
- Department
of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka, Fukuoka 819-0395, Japan
| | - Hideto Yoshida
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Keisuke Ide
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Shigenori Ueda
- Research
Center for Functional Materials, National
Institute for Materials Science, Namiki, Tsukuba 305-0044, Japan
- Research
Center for Advanced Measurement and Characterization, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Synchrotron
X-ray Station at SPring-8, National Institute
for Materials Science, 1-1-1 Sayo, Hyogo, 679-5148, Japan
| | - Hidenori Hiramatsu
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
- Materials
Research Center for Element Strategy, Tokyo
Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hiroshi Kumigashira
- Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Hideo Hosono
- Materials
Research Center for Element Strategy, Tokyo
Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Laboratory
for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
- Materials
Research Center for Element Strategy, Tokyo
Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
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8
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Katase T, Takahashi Y, He X, Tadano T, Ide K, Yoshida H, Kawachi S, Yamaura JI, Sasase M, Hiramatsu H, Hosono H, Kamiya T. Reversible 3D-2D structural phase transition and giant electronic modulation in nonequilibrium alloy semiconductor, lead-tin-selenide. Sci Adv 2021; 7:7/12/eabf2725. [PMID: 33741599 PMCID: PMC7978423 DOI: 10.1126/sciadv.abf2725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
Material properties depend largely on the dimensionality of the crystal structures and the associated electronic structures. If the crystal-structure dimensionality can be switched reversibly in the same material, then a drastic property change may be controllable. Here, we propose a design route for a direct three-dimensional (3D) to 2D structural phase transition, demonstrating an example in (Pb1-x Sn x )Se alloy system, where Pb2+ and Sn2+ have similar ns2 pseudo-closed shell configurations, but the former stabilizes the 3D rock-salt-type structure while the latter a 2D layered structure. However, this system has no direct phase boundary between these crystal structures under thermal equilibrium. We succeeded in inducing the direct 3D-2D structural phase transition in (Pb1-x Sn x )Se alloy epitaxial films by using a nonequilibrium growth technique. Reversible giant electronic property change was attained at x ~ 0.5 originating in the abrupt band structure switch from gapless Dirac-like state to semiconducting state.
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Affiliation(s)
- Takayoshi Katase
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
| | - Yudai Takahashi
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Xinyi He
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Terumasa Tadano
- National Institute for Materials Science, Sengen, Tsukuba 305-0047, Japan
| | - Keisuke Ide
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hideto Yoshida
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Shiro Kawachi
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Jun-Ichi Yamaura
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Masato Sasase
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
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9
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Sato H, Hiramatsu H, Kamiya T, Hosono H. Strain Engineering at Heterointerfaces: Application to an Iron Pnictide Superconductor, Cobalt-Doped BaFe 2As 2. ACS Appl Mater Interfaces 2020; 12:50096-50104. [PMID: 33079530 DOI: 10.1021/acsami.0c12080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We propose a unique strategy to apply stronger strain at heterointerfaces than conventional epitaxial strain methods to extract hidden attractive physical/chemical properties in materials. This strategy involves precisely accounting for the epitaxial strain induced by lattice mismatch as well as the differences in the thermal expansion coefficients and compressibilities of epitaxial films and substrates. We selected optimally cobalt-doped BaFe2As2(Ba122:Co), an iron-based superconductor with a bulk critical temperature (Tc) of 22 K, as a model material and four types of single-crystal substrates. Ba122:Co was selected because its Tc is robust to hydrostatic pressure but sensitive to epitaxial strain (i.e., one of the anisotropic strains), and the selected substrates entirely cover the positive/negative lattice mismatches, thermal expansion coefficients, and compressibilities with respect to Ba122:Co. With strong anisotropic strain successfully induced by film growth, external hydrostatic pressurizing, and cooling processes, we observed unique carrier transport properties in Ba122:Co epitaxial films on CaF2 and BaF2 substrates including (i) upturn behavior in the temperature dependence of the longitudinal resistivity, (ii) negative magnetoresistance, (iii) large enhancement of anomalous Hall effects in the epitaxial films on CaF2, and (iv) enhancement of Tc to 27 K in the epitaxial films on BaF2. These results demonstrate the effectiveness of our strategy, and this approach can be further extended to other inorganic materials in thin-film form.
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Affiliation(s)
- Hikaru Sato
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
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10
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Oner Y, Boyraz C, Hiramatsu H, Katase T, Hosono H. Coexistence of magnetism and superconductivity in thin films of the Fe-based superconductor Ba 1-xLa xFe 2As 2. J Phys Condens Matter 2020; 32:485804. [PMID: 32897875 DOI: 10.1088/1361-648x/aba922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magnetization measurements have been performed to understand the role of the magnetic structure on the superconducting properties of epitaxial thin films of Ba1-x La x Fe2As2 (x = 0.08, 0.13, and 0.18) deposited on single crystal (001)-oriented MgO substrates by pulsed laser deposition. All samples exhibit a reentrant-spinglass like behavior at normal state. At lower temperatures, we observe the same magnetic state coexisting with superconductivity and it is also observed a prominent non-linear giant diamagnetism in an intermediate temperature range just above the superconducting phase transition temperature. Furthermore, no significant change in the magnetic domain structure was detected by the onset of superconductivity. Based on their magnetic states, we claim that each domain (as a disconnected superconducting island) has its own bulk superconducting properties. Finally, we discussed the dual character played by the La atoms in the superconducting properties. That duality character has been also confirmed by analyzing resistivity data.
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Affiliation(s)
- Yildirhan Oner
- Istanbul Technical University, Department of Physics Engineering, 34469, Maslak, Istanbul, Turkey
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11
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Tsuji M, Hiramatsu H, Hosono H. Tunable Light Emission through the Range 1.8-3.2 eV and p-Type Conductivity at Room Temperature for Nitride Semiconductors, Ca(Mg 1-xZn x) 2N 2 ( x = 0-1). Inorg Chem 2019; 58:12311-12316. [PMID: 31465209 DOI: 10.1021/acs.inorgchem.9b01811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The ternary nitride CaZn2N2, composed only of earth-abundant elements, is a novel semiconductor with a band gap of ∼1.8 eV. First-principles calculations predict that continuous Mg substitution at the Zn site will change the optical band gap in a wide range from ∼3.3-1.9 eV for Ca(Mg1-xZnx)2N2 (x = 0-1). In this study, we demonstrate that a solid-state reaction at ambient pressure and a high-pressure synthesis at 5 GPa produce x = 0 and 0.12 and 0.12 < x ≤ 1 polycrystalline samples, respectively. It is experimentally confirmed that the optical band gap can be continuously tuned from ∼3.2 to ∼1.8 eV, a range very close to that predicted by theory. Band to band photoluminescence is observed at room temperature in the ultraviolet-red region depending on x. A 2% Na doping at the Ca site of Ca(Mg1-xZnx)2N2 converts its highly resistive state to a p-type conducting state. Particularly, the x = 0.50 sample exhibits intense green emission with a peak at 2.45 eV (506 nm) without any other emission from deep-level defects. These features meet the demands of III-V group nitride and arsenide/phosphide light-emitting semiconductors.
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Affiliation(s)
- Masatake Tsuji
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.,Materials Research Center for Element Strategy , Tokyo Institute of Technology , Mailbox SE-1, 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , Mailbox SE-1, 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
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12
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Tojo Y, Shibuya T, Nakamura T, Shoji K, Fujioka H, Matoba M, Yasui S, Itoh M, Iimura S, Hiramatsu H, Hosono H, Hirai S, Mao W, Kitao S, Seto M, Kamihara Y. Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr 2VFeAsO 3-δ , a superconductor. J Phys Condens Matter 2019; 31:115801. [PMID: 30537680 DOI: 10.1088/1361-648x/aaf7e0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We elucidate the magnetic phases and superconducting (SC) transition temperatures (T c) in Sr2VFeAsO3-δ (21113V), an iron-based superconductor with a thick-blocking layer fabricated from a perovskite-related transition metal oxide. At low temperatures (T < 37.1 K), 21113V exhibited a SC phase in the range 0.031 ⩽ δ ⩽ 0.145 and an antiferromagnetic (AFM) iron sublattice in the range 0.267 ⩽ δ ⩽ 0.664. Mixed-valent vanadium exhibited a dominant AFM phase in 0.031 ⩽ δ ⩽ 0.088, and a partial ferrimagnetic (Ferri.) phase in the range 0.124 ⩽ δ ⩽ 0.664. The Ferri. phase was the most dominant at a δ value of 0.267, showing an AFM phase of Fe at T < 20 K. Increasing the spontaneous magnetic moments reduced the magnetic shielding volume fraction due to the SC phase. This result was attributed to the magnetic phase of vanadium, which dominates the superconductivity of Fe in 21113V. The T c-δ curve showed two maxima. The smaller and larger of T c maxima occurred at δ = 0.073 and δ = 0.145, respectively; the latter resides on the phase boundary between AFM and the partial Ferri. phases of vanadium. 21113V is a useful platform for verifing new mechanisms of T c enhancement in iron-based superconductors.
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Affiliation(s)
- Yujiro Tojo
- Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
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13
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Hanzawa K, Iimura S, Hiramatsu H, Hosono H. Material Design of Green-Light-Emitting Semiconductors: Perovskite-Type Sulfide SrHfS 3. J Am Chem Soc 2019; 141:5343-5349. [PMID: 30840450 DOI: 10.1021/jacs.8b13622] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A current issue facing light-emitting devices is a missing suitable material for green emission. To overcome this, we explore semiconductors possessing (i) a deep conduction band minimum (CBM) and a shallow valence band maximum (VBM), (ii) good controllability of electronic conductivity and carrier polarity, and (iii) a directly allowed band gap corresponding to green emission. We focus on early transition metal ( eTM)-based perovskites. The eTM cation's high and stable valence state makes its carrier controllability easy, and the eTM's nonbonding d orbital and the anion's p orbital, which constitute the deep CBM and shallow VBM, are favorable to n- and p-type doping, respectively. To obtain a direct band gap, we applied a scheme that folds the bands constituting the VBM at the zone boundary to the zone center where the CBM appears. Orthorhombic SrHfS3 was chosen as the candidate. The electrical conductivity was tuned from 6 × 10-7 to 7 × 10-1 S·cm-1 with lanthanum (La) doping and to 2 × 10-4 S·cm-1 with phosphorus (P) doping. Simultaneously, the major carrier polarity was controlled to n type by La doping and to p type by P doping. Both the undoped and doped SrHfS3 exhibited intense green photoluminescence (PL) at 2.37 eV. From the PL blue shift and short lifetime, we attributed the emission to a band-to-band transition and/or exciton. These results demonstrate that SrHfS3 is a promising green-light-emitting semiconductor.
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Affiliation(s)
- Kota Hanzawa
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan
| | - Soshi Iimura
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan.,Materials Research Center for Element Strategy , Tokyo Institute of Technology , Mailbox SE-1, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan
| | - Hideo Hosono
- Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan.,Materials Research Center for Element Strategy , Tokyo Institute of Technology , Mailbox SE-1, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan
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14
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Muraba Y, Iimura S, Matsuishi S, Hiramatsu H, Honda T, Ikeda K, Otomo T, Hosono H. Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors. Dalton Trans 2018; 47:12964-12971. [PMID: 30156262 DOI: 10.1039/c8dt02387e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron-based superconductors can be categorized into two types of parent compounds by considering the nature of their temperature-induced phase transitions; namely, first order transitions for 122- and 11-type compounds and second-order transitions for 1111-type compounds. This work examines the structural and magnetic transitions (ST and MT) of CaFeAsH by specific heat, X-ray diffraction, neutron diffraction, and electrical resistivity measurements. Heat capacity measurements revealed a second-order phase transition that accompanies an apparent single peak at 96 K. However, a clear ST from the tetragonal to orthorhombic phase and an MT from the paramagnetic to the antiferromagnetic phase were detected. The structural (Ts) and Néel temperatures (TN) were respectively determined to be 95(2) and 96 K by X-ray and neutron diffraction and resistivity measurements. This small temperature difference, Ts-TN, was attributed to strong magnetic coupling in the inter-layer direction owing to CaFeAsH having the shortest lattice constant c among parent 1111-type iron arsenides. Considering that a first-order transition takes place in 11- and 122-type compounds with a short inter-layer distance, we conclude that the nature of the ST and MT in CaFeAsH is intermediate in character, between the second-order transition for 1111-type compounds and the first-order transition for other 11- and 122-type compounds.
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Affiliation(s)
- Yoshinori Muraba
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
| | - Soshi Iimura
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Satoru Matsuishi
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. and Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Takashi Honda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. and Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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15
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Kato M, Kenji S, Murakami M, Hiramatsu H. P2.17-16 Radical en Bloc Resection for Lung Cancer Invading the Spine. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Xiao Z, Ran FY, Liao M, Hiramatsu H, Ide K, Hosono H, Kamiya T. Multiple states and roles of hydrogen in p-type SnS semiconductors. Phys Chem Chem Phys 2018; 20:20952-20956. [DOI: 10.1039/c8cp02261e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The states and roles of hydrogen in p-type SnS are studied by hydrogen plasma treatment and density functional theory calculations.
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Affiliation(s)
- Zewen Xiao
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Fan-Yong Ran
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Min Liao
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- Laboratory for Materials and Structures
| | - Keisuke Ide
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- Laboratory for Materials and Structures
| | - Hideo Hosono
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- Laboratory for Materials and Structures
| | - Toshio Kamiya
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- Laboratory for Materials and Structures
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17
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Wang J, Hanzawa K, Hiramatsu H, Kim J, Umezawa N, Iwanaka K, Tada T, Hosono H. Exploration of Stable Strontium Phosphide-Based Electrides: Theoretical Structure Prediction and Experimental Validation. J Am Chem Soc 2017; 139:15668-15680. [DOI: 10.1021/jacs.7b06279] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Junjie Wang
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,
Yokohama, Kanagawa 226-8503, Japan
- International Center for Materials Nanoarchitectonics
(MANA), National Institute for Materials Sciences, Ibaraki 305-0044, Japan
| | - Kota Hanzawa
- Laboratory for Materials
and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox
R3-4, 4259 Nagatsuta-cho, Midori-ku,
Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,
Yokohama, Kanagawa 226-8503, Japan
- Laboratory for Materials
and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox
R3-4, 4259 Nagatsuta-cho, Midori-ku,
Yokohama 226-8503, Japan
| | - Junghwan Kim
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,
Yokohama, Kanagawa 226-8503, Japan
| | - Naoto Umezawa
- International Center for Materials Nanoarchitectonics
(MANA), National Institute for Materials Sciences, Ibaraki 305-0044, Japan
| | - Koki Iwanaka
- Laboratory for Materials
and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox
R3-4, 4259 Nagatsuta-cho, Midori-ku,
Yokohama 226-8503, Japan
| | - Tomofumi Tada
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,
Yokohama, Kanagawa 226-8503, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,
Yokohama, Kanagawa 226-8503, Japan
- Laboratory for Materials
and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox
R3-4, 4259 Nagatsuta-cho, Midori-ku,
Yokohama 226-8503, Japan
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18
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Hiramatsu H, Yusa H, Igarashi R, Ohishi Y, Kamiya T, Hosono H. An Exceptionally Narrow Band-Gap (∼4 eV) Silicate Predicted in the Cubic Perovskite Structure: BaSiO 3. Inorg Chem 2017; 56:10535-10542. [PMID: 28812880 DOI: 10.1021/acs.inorgchem.7b01510] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electronic structures of 35 A2+B4+O3 ternary cubic perovskite oxides, including their hypothetical chemical compositions, were calculated by a hybrid functional method with the expectation that peculiar electronic structures and unique carrier transport properties suitable for semiconductor applications would be hidden in high-symmetry cubic perovskite oxides. We found unique electronic structures of Si-based oxides (A = Mg, Ca, Sr, and Ba, and B = Si). In particular, the unreported cubic BaSiO3 has a very narrow band gap (4.1 eV) compared with conventional nontransition-metal silicates (e.g., ∼9 eV for SiO2 and the calculated value of 7.3 eV for orthorhombic BaSiO3) and a small electron effective mass (0.3m0, where m0 is the free electron rest mass). The narrow band gap is ascribed to the nonbonding state of Si 3s and the weakened Madelung potential. The existence of the predicted cubic perovskite structure of BaSiO3 was experimentally verified by applying a high pressure of 141 GPa. The present finding indicates that it could be possible to develop a new transparent oxide semiconductor of earth abundant silicates if the symmetry of its crystal structure is appropriately chosen. Cubic BaSiO3 is a candidate for high-performance oxide semiconductors if this phase can be stabilized at room temperature and ambient pressure.
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Affiliation(s)
- Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology , Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials Research Center for Element Strategy, Tokyo Institute of Technology , Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hitoshi Yusa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Ryo Igarashi
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology , Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Yasuo Ohishi
- Japan Synchrotron Radiation Research Institute (JASRI) , 1-1-1 Kouto, Sayo-cho 679-5198, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology , Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials Research Center for Element Strategy, Tokyo Institute of Technology , Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology , Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials Research Center for Element Strategy, Tokyo Institute of Technology , Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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19
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Hanna T, Hiramatsu H, Sakaguchi I, Hosono H. Highly hydrogen-sensitive thermal desorption spectroscopy system for quantitative analysis of low hydrogen concentration (∼1 × 10 16 atoms/cm 3) in thin-film samples. Rev Sci Instrum 2017; 88:053103. [PMID: 28571433 DOI: 10.1063/1.4982255] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We developed a highly hydrogen-sensitive thermal desorption spectroscopy (HHS-TDS) system to detect and quantitatively analyze low hydrogen concentrations in thin films. The system was connected to an in situ sample-transfer chamber system, manipulators, and an rf magnetron sputtering thin-film deposition chamber under an ultra-high-vacuum (UHV) atmosphere of ∼10-8 Pa. The following key requirements were proposed in developing the HHS-TDS: (i) a low hydrogen residual partial pressure, (ii) a low hydrogen exhaust velocity, and (iii) minimization of hydrogen thermal desorption except from the bulk region of the thin films. To satisfy these requirements, appropriate materials and components were selected, and the system was constructed to extract the maximum performance from each component. Consequently, ∼2000 times higher sensitivity to hydrogen than that of a commercially available UHV-TDS system was achieved using H+-implanted Si samples. Quantitative analysis of an amorphous oxide semiconductor InGaZnO4 thin film (1 cm × 1 cm × 1 μm thickness, hydrogen concentration of 4.5 × 1017 atoms/cm3) was demonstrated using the HHS-TDS system. This concentration level cannot be detected using UHV-TDS or secondary ion mass spectroscopy (SIMS) systems. The hydrogen detection limit of the HHS-TDS system was estimated to be ∼1 × 1016 atoms/cm3, which implies ∼2 orders of magnitude higher sensitivity than that of SIMS and resonance nuclear reaction systems (∼1018 atoms/cm3).
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Affiliation(s)
- Taku Hanna
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Isao Sakaguchi
- National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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Kurota T, Sato I, Kuroi K, Hiramatsu H, Nakabayashi T. Change in the structure and function of lectin by photodissociation of NO. Chem Commun (Camb) 2017; 53:10014-10017. [DOI: 10.1039/c7cc04795a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We have shown here that the structure and sugar-binding activity of lectin can be changed by the photodissociation of NO.
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Affiliation(s)
- T. Kurota
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - I. Sato
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - K. Kuroi
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - H. Hiramatsu
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
- Department of Applied Chemistry and Institute of Molecular Science
| | - T. Nakabayashi
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
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Sato H, Hiramatsu H, Kamiya T, Hosono H. Enhanced critical-current in P-doped BaFe 2As 2 thin films on metal substrates arising from poorly aligned grain boundaries. Sci Rep 2016; 6:36828. [PMID: 27833118 PMCID: PMC5104974 DOI: 10.1038/srep36828] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 10/21/2016] [Indexed: 11/29/2022] Open
Abstract
Thin films of the iron-based superconductor BaFe2(As1-xPx)2 (Ba122:P) were fabricated on polycrystalline metal-tape substrates with two kinds of in-plane grain boundary alignments (well aligned (4°) and poorly aligned (8°)) by pulsed laser deposition. The poorly aligned substrate is not applicable to cuprate-coated conductors because the in-plane alignment >4° results in exponential decay of the critical current density (Jc). The Ba122:P film exhibited higher Jc at 4 K when grown on the poorly aligned substrate than on the well-aligned substrate even though the crystallinity was poorer. It was revealed that the misorientation angles of the poorly aligned samples were less than 6°, which are less than the critical angle of an iron-based superconductor, cobalt-doped BaFe2As2 (~9°), and the observed strong pinning in the Ba122:P is attributed to the high-density grain boundaries with the misorientation angles smaller than the critical angle. This result reveals a distinct advantage over cuprate-coated conductors because well-aligned metal-tape substrates are not necessary for practical applications of the iron-based superconductors.
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Affiliation(s)
- Hikaru Sato
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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Uehara K, Nakayama G, Ishigure K, Kobayashi S, Hiramatsu H, Nakayama H, Yamashita K, Sakamoto E, Tojima Y, Kawai S, Kodera Y, Nagino M. 2016 Early results of phase II trial of perioperative oxaliplatin and capecitabine (XELOX) without radiotherapy for high-risk rectal cancer (CORONA I). Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30940-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Orui T, Herms J, Hanyu Y, Ueda S, Watanabe K, Sakaguchi I, Ohashi N, Hiramatsu H, Kumomi H, Hosono H, Kamiya T. Charge Compensation by Excess Oxygen in Amorphous In–Ga–Zn–O Films Deposited by Pulsed Laser Deposition. ACTA ACUST UNITED AC 2015. [DOI: 10.1109/jdt.2014.2358251] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Grochowski J, Hanyu Y, Abe K, Kaczmarski J, Dyczewski J, Hiramatsu H, Kumomi H, Hosono H, Kamiya T. Origin of Lower Film Density and Larger Defect Density in Amorphous In–Ga–Zn–O Deposited at High Total Pressure. ACTA ACUST UNITED AC 2015. [DOI: 10.1109/jdt.2014.2359746] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hosono H, Tanabe K, Takayama-Muromachi E, Kageyama H, Yamanaka S, Kumakura H, Nohara M, Hiramatsu H, Fujitsu S. Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides. Sci Technol Adv Mater 2015; 16:033503. [PMID: 27877784 PMCID: PMC5099821 DOI: 10.1088/1468-6996/16/3/033503] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 04/28/2015] [Indexed: 06/02/2023]
Abstract
This review shows the highlights of a 4-year-long research project supported by the Japanese Government to explore new superconducting materials and relevant functional materials. The project found several tens of new superconductors by examining ∼1000 materials, each of which was chosen by Japanese experts with a background in solid state chemistry. This review summarizes the major achievements of the project in newly found superconducting materials, and the fabrication wires and tapes of iron-based superconductors; it incorporates a list of ∼700 unsuccessful materials examined for superconductivity in the project. In addition, described are new functional materials and functionalities discovered during the project.
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Affiliation(s)
- Hideo Hosono
- Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Keiichi Tanabe
- Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 2-11-19 Minowa-cho, Kohoku-ku, Yokohama, Kanagawa 223-0051, Japan
| | | | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Shoji Yamanaka
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Hiroaki Kumakura
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Minoru Nohara
- Department of Physics, Okayama University, Okayama 700-8530, Japan
| | - Hidenori Hiramatsu
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Satoru Fujitsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Ran FY, Xiao Z, Toda Y, Hiramatsu H, Hosono H, Kamiya T. n-type conversion of SnS by isovalent ion substitution: Geometrical doping as a new doping route. Sci Rep 2015; 5:10428. [PMID: 26020855 PMCID: PMC4446993 DOI: 10.1038/srep10428] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 04/13/2015] [Indexed: 11/21/2022] Open
Abstract
Tin monosulfide (SnS) is a naturally p-type semiconductor with a layered crystal structure, but no reliable n-type SnS has been obtained by conventional aliovalent ion substitution. In this work, carrier polarity conversion to n-type was achieved by isovalent ion substitution for polycrystalline SnS thin films on glass substrates. Substituting Pb2+ for Sn2+ converted the majority carrier from hole to electron, and the free electron density ranged from 1012 to 1015 cm−3 with the largest electron mobility of 7.0 cm2/(Vs). The n-type conduction was confirmed further by the position of the Fermi level (EF) based on photoemission spectroscopy and electrical characteristics of pn heterojunctions. Density functional theory calculations reveal that the Pb substitution invokes a geometrical size effect that enlarges the interlayer distance and subsequently reduces the formation energies of Sn and Pb interstitials, which results in the electron doping.
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Affiliation(s)
- Fan-Yong Ran
- 1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Zewen Xiao
- 1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Yoshitake Toda
- 1] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- 1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Hideo Hosono
- 1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [3] Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- 1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2] Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Sakashita K, Kato I, Daifu T, Saida S, Hiramatsu H, Nishinaka Y, Ebihara Y, Ma F, Matsuda K, Saito S, Hirabayashi K, Kurata T, Uyen LTN, Nakazawa Y, Tsuji K, Heike T, Nakahata T, Koike K. In vitro expansion of CD34(+)CD38(-) cells under stimulation with hematopoietic growth factors on AGM-S3 cells in juvenile myelomonocytic leukemia. Leukemia 2015; 29:606-14. [PMID: 25102944 DOI: 10.1038/leu.2014.239] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 07/09/2013] [Accepted: 07/24/2014] [Indexed: 12/11/2022]
Abstract
Using serum-containing culture, we examined whether AGM-S3 stromal cells, alone or in combination with hematopoietic growth factor(s), stimulated the proliferation of CD34(+) cells from patients with juvenile myelomonocytic leukemia (JMML). AGM-S3 cells in concert with stem cell factor plus thrombopoietin increased the numbers of peripheral blood CD34(+) cells to approximately 20-fold of the input value after 2 weeks in nine JMML patients with either PTPN11 mutations or RAS mutations, who received allogeneic hematopoietic transplantation. Granulocyte-macrophage colony-stimulating factor (GM-CSF) also augmented the proliferation of JMML CD34(+) cells on AGM-S3 cells. The expansion potential of CD34(+) cells was markedly low in four patients who achieved spontaneous hematological improvement. A large proportion of day-14-cultured CD34(+) cells were negative for CD38 and cryopreservable. Cultured JMML CD34(+)CD38(-) cells expressed CD117, CD116, c-mpl, CD123, CD90, but not CXCR4, and formed GM and erythroid colonies. Day-7-cultured CD34(+) cells from two of three JMML patients injected intrafemorally into immunodeficient mice stimulated with human GM-CSF after transplantation displayed significant hematopoietic reconstitution. The abilities of OP9 cells and MS-5 cells were one-third and one-tenth, respectively, of the value obtained with AGM-S3 cells. Our culture system may provide a useful tool for elucidating leukemogenesis and for therapeutic approaches in JMML.
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MESH Headings
- ADP-ribosyl Cyclase 1/genetics
- ADP-ribosyl Cyclase 1/metabolism
- Adolescent
- Animals
- Antigens, CD34/genetics
- Antigens, CD34/metabolism
- Cell Proliferation/drug effects
- Clone Cells
- Coculture Techniques
- Embryonic Stem Cells/drug effects
- Embryonic Stem Cells/metabolism
- Embryonic Stem Cells/pathology
- GTP Phosphohydrolases/genetics
- GTP Phosphohydrolases/metabolism
- Gene Expression Regulation, Leukemic
- Granulocyte-Macrophage Colony-Stimulating Factor/pharmacology
- Hematopoietic Stem Cells/drug effects
- Hematopoietic Stem Cells/metabolism
- Hematopoietic Stem Cells/pathology
- Humans
- Leukemia, Myelomonocytic, Juvenile/genetics
- Leukemia, Myelomonocytic, Juvenile/metabolism
- Leukemia, Myelomonocytic, Juvenile/pathology
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Mutation
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/pathology
- Neoplastic Stem Cells/transplantation
- Protein Tyrosine Phosphatase, Non-Receptor Type 11/genetics
- Protein Tyrosine Phosphatase, Non-Receptor Type 11/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins p21(ras)
- Signal Transduction
- Stromal Cells/drug effects
- Stromal Cells/metabolism
- Stromal Cells/pathology
- ras Proteins/genetics
- ras Proteins/metabolism
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Affiliation(s)
- K Sakashita
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - I Kato
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Daifu
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - S Saida
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - H Hiramatsu
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Nishinaka
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
| | - Y Ebihara
- 1] Department of Pediatric Hematology/Oncology, Research Hospital, Institute of Medical Science, University of Tokyo, Minato-ku, Japan [2] Division of Stem Cell Processing, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Minato-ku, Japan
| | - F Ma
- 1] Division of Stem Cell Processing, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Minato-ku, Japan [2] Institute of Blood Transfusion, Chinese Academy of Medical Sciences and Peking Union Medical College, Chengdu, China
| | - K Matsuda
- Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto, Japan
| | - S Saito
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - K Hirabayashi
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - T Kurata
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - L T N Uyen
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - Y Nakazawa
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
| | - K Tsuji
- 1] Department of Pediatric Hematology/Oncology, Research Hospital, Institute of Medical Science, University of Tokyo, Minato-ku, Japan [2] Division of Stem Cell Processing, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Minato-ku, Japan [3] Department of Pediatrics, Shinshu Ueda Medical Center, National Hospital Organization, Ueda, Japan
| | - T Heike
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Nakahata
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
| | - K Koike
- Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan
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Hiramatsu H, Sugiura Y, Kamio Y, Kamiya M. Transvenous Embolization of a Dural Arteriovenous Fistula Involving the Suboccipital Cavernous Sinus. Clin Neuroradiol 2014; 25:419-22. [PMID: 25500959 DOI: 10.1007/s00062-014-0356-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 10/17/2014] [Indexed: 11/30/2022]
Affiliation(s)
- H Hiramatsu
- Departments of Neurosurgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, 431-3192, Hamamatsu, Japan.
| | - Y Sugiura
- Department of Endovascular Neurosurgery, Seirei Mikatahara Hospital, Hamamatsu, Japan
| | - Y Kamio
- Departments of Neurosurgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, 431-3192, Hamamatsu, Japan
| | - M Kamiya
- Department of Radiology, Hamamatsu University School of Medicine, Hamamatsu, Japan
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29
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Xiao Z, Hiramatsu H, Ueda S, Toda Y, Ran FY, Guo J, Lei H, Matsuishi S, Hosono H, Kamiya T. Narrow bandgap in β-BaZn₂As₂ and its chemical origins. J Am Chem Soc 2014; 136:14959-65. [PMID: 25255380 DOI: 10.1021/ja507890u] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
β-BaZn2As2 is known to be a p-type semiconductor with the layered crystal structure similar to that of LaZnAsO, leading to the expectation that β-BaZn2As2 and LaZnAsO have similar bandgaps; however, the bandgap of β-BaZn2As2 (previously reported value ~0.2 eV) is 1 order of magnitude smaller than that of LaZnAsO (1.5 eV). In this paper, the reliable bandgap value of β-BaZn2As2 is determined to be 0.23 eV from the intrinsic region of the temperature dependence of electrical conductivity. The origins of this narrow bandgap are discussed based on the chemical bonding nature probed by 6 keV hard X-ray photoemission spectroscopy, hybrid density functional calculations, and the ligand theory. One origin is the direct As-As hybridization between adjacent [ZnAs] layers, which leads to a secondary splitting of As 4p levels and raises the valence band maximum. The other is that the nonbonding Ba 5d(x(2)-y(2)) orbitals form an unexpectedly deep conduction band minimum (CBM) in β-BaZn2As2 although the CBM of LaZnAsO is formed mainly of Zn 4s. These two origins provide a quantitative explanation for the bandgap difference between β-BaZn2As2 and LaZnAsO.
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Affiliation(s)
- Zewen Xiao
- Materials and Structures Laboratory, ‡Materials Research Center for Element Strategy, and #Frontier Research Center, Tokyo Institute of Technology , Yokohama 226-8503, Japan
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30
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Hiramatsu H, Matsuda S, Sato H, Kamiya T, Hosono H. Growth of c-axis-oriented superconducting KFe₂As₂ thin films. ACS Appl Mater Interfaces 2014; 6:14293-14301. [PMID: 25032799 DOI: 10.1021/am5036016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
KFe2As2, an iron-based superconductor, is expected to exhibit large spin Hall conductivity, and fabrication of high-quality thin films is requisite for evaluation of this effect and application to spintronics devices. Thin-film growth of KFe2As2 is difficult because of two intrinsic properties; its extremely hygroscopic nature and the high vapor pressure of potassium. We solved these issues by combining room-temperature pulsed laser deposition using K-rich KFe2As2 targets with thermal crystallization in KFe2As2 powder after encapsulation in an evacuated silica-glass tube with all of the processes conducted in a vacuum chamber and a dry Ar atmosphere in a glovebox. The optimized KFe2As2 films on (La,Sr)(Al,Ta)O3 single-crystal substrates were obtained by crystallization at 700 °C, and they were strongly c-axis oriented. The electrical measurements were performed with thin films protected by grease passivation to block reaction with the atmosphere. The KFe2As2 films exhibited a superconductivity transition at 3.7 K.
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Affiliation(s)
- Hidenori Hiramatsu
- Materials and Structures Laboratory, Tokyo Institute of Technology , Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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31
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Classen CF, William D, Linnebacher M, Farhod A, Kedr W, Elsabe B, Fadel S, Van Gool S, De Vleeschouwer S, Koks C, Garg A, Ehrhardt M, Riva M, De Vleeschouwer S, Agostinis P, Graf N, Van Gool S, Yao TW, Yoshida Y, Zhang J, Ozawa T, James D, Nicolaides T, Kebudi R, Cakir FB, Gorgun O, Agaoglu FY, Darendeliler E, Van Gool S, De Vleeschouwer S, Al-Kofide A, Al-Shail E, Khafaga Y, Al-Hindi H, Dababo M, Haq AU, Anas M, Barria MG, Siddiqui K, Hassounah M, Ayas M, van Zanten SV, Jansen M, van Vuurden D, Huisman M, Vugts D, Hoekstra O, van Dongen G, Kaspers G, Cockle J, Ilett E, Scott K, Bruning-Richardson A, Picton S, Short S, Melcher A, Benesch M, Warmuth-Metz M, von Bueren AO, Hoffmann M, Pietsch T, Kortmann RD, Eyrich M, Graf N, Rutkowski S, Fruhwald MC, Faber J, Kramm C, Porkholm M, Valanne L, Lonnqvist T, Holm S, Lannering B, Riikonen P, Wojcik D, Sehested A, Clausen N, Harila-Saari A, Schomerus E, Thorarinsdottir HK, Lahteenmaki P, Arola M, Thomassen H, Saarinen-Pihkala UM, Kivivuori SM, Buczkowicz P, Hoeman C, Rakopoulos P, Pajovic S, Morrison A, Bouffet E, Bartels U, Becher O, Hawkins C, Gould TWA, Rahman CV, Smith SJ, Barrett DA, Shakesheff KM, Grundy RG, Rahman R, Barua N, Cronin D, Gill S, Lowisl S, Hochart A, Maurage CA, Rocourt N, Vinchon M, Kerdraon O, Escande F, Grill J, Pick VK, Leblond P, Burzynski G, Janicki T, Burzynski S, Marszalek A, Ramani N, Zaky W, Kannan G, Morani A, Sandberg D, Ketonen L, Maher O, Corrales-Medina F, Meador H, Khatua S, Brassesco M, Delsin L, Roberto G, Silva C, Ana L, Rego E, Scrideli C, Umezawa K, Tone L, Kim SJ, Kim CY, Kim IA, Han JH, Choi BS, Ahn HS, Choi HS, Haque F, Rahman R, Layfield R, Grundy R, Gandola L, Pecori E, Biassoni V, Schiavello E, Chiruzzi C, Spreafico F, Modena P, Bach F, Pignoli E, Massimino M, Drogosiewicz M, Dembowska-Baginska B, Jurkiewicz E, Filipek I, Perek-Polnik M, Swieszkowska E, Perek D, Bender S, Jones DT, Warnatz HJ, Hutter B, Zichner T, Gronych J, Korshunov A, Eils R, Korbel JO, Yaspo ML, Lichter P, Pfister SM, Yadavilli S, Becher OJ, Kambhampati M, Packer RJ, Nazarian J, Lechon FC, Fowkes L, Khabra K, Martin-Retortillo LM, Marshall LV, Vaidya S, Koh DM, Leach MO, Pearson AD, Zacharoulis S, Lechon FC, Fowkes L, Khabra K, Martin-Retortillo LM, Marshall LV, Schrey D, Barone G, Vaidya S, Koh DM, Pearson AD, Zacharoulis S, Panditharatna E, Stampar M, Siu A, Gordish-Dressman H, Devaney J, Kambhampati M, Hwang EI, Packer RJ, Nazarian J, Chung AH, Mittapalli RK, Elmquist WF, Becher OJ, Castel D, Debily MA, Philippe C, Truffaux N, Taylor K, Calmon R, Boddaert N, Le Dret L, Saulnier P, Lacroix L, Mackay A, Jones C, Puget S, Sainte-Rose C, Blauwblomme T, Varlet P, Grill J, Entz-Werle N, Maugard C, Bougeard G, Nguyen A, Chenard MP, Schneider A, Gaub MP, Tsoli M, Vanniasinghe A, Luk P, Dilda P, Haber M, Hogg P, Ziegler D, Simon S, Tsoli M, Vanniasinghe A, Monje M, Gurova K, Gudkov A, Haber M, Ziegler D, Zapotocky M, Churackova M, Malinova B, Zamecnik J, Kyncl M, Tichy M, Puchmajerova A, Stary J, Sumerauer D, Boult J, Vinci M, Taylor K, Perryman L, Box G, Jury A, Popov S, Ingram W, Monje M, Eccles S, Jones C, Robinson S, Emir S, Demir HA, Bayram C, Cetindag F, Kabacam GB, Fettah A, Boult J, Li J, Vinci M, Jury A, Popov S, Jamin Y, Cummings C, Eccles S, Bamber J, Sinkus R, Jones C, Robinson S, Nandhabalan M, Bjerke L, Vinci M, Burford A, Ingram W, Mackay A, von Bueren A, Baudis M, Clarke P, Collins I, Workman P, Jones C, Taylor K, Mackay A, Vinci M, Popov S, Ingram W, Entz-Werle N, Monje M, Olaciregui N, Mora J, Carcaboso A, Bullock A, Jones C, Vinci M, Mackay A, Burford A, Taylor K, Popov S, Ingram W, Monje M, Alonso M, Olaciregui N, de Torres C, Cruz O, Mora J, Carcaboso A, Jones C, Filipek I, Drogosiewicz M, Perek-Polnik M, Swieszkowska E, Dembowska-Baginska B, Jurkiewicz E, Perek D, Nguyen A, Pencreach E, Mackay A, Moussalieh FM, Guenot D, Namer I, Chenard MP, Jones C, Entz-Werle N, Pollack I, Jakacki R, Butterfield L, Hamilton R, Panigrahy A, Potter D, Connelly A, Dibridge S, Whiteside T, Okada H, Ahsan S, Raabe E, Haffner M, Warren K, Quezado M, Ballester L, Nazarian J, Eberhart C, Rodriguez F, Ramachandran C, Nair S, Quirrin KW, Khatib Z, Escalon E, Melnick S, Classen CF, Hofmann M, Schmid I, Simon T, Maass E, Russo A, Fleischhack G, Becker M, Hauch H, Sander A, Kramm C, Grasso C, Truffaux N, Berlow N, Liu L, Debily MA, Davis L, Huang E, Woo P, Tang Y, Ponnuswami A, Chen S, Huang Y, Hutt-Cabezas M, Warren K, Dret L, Meltzer P, Mao H, Quezado M, van Vuurden D, Abraham J, Fouladi M, Svalina MN, Wang N, Hawkins C, Raabe E, Hulleman E, Li XN, Keller C, Spellman PT, Pal R, Grill J, Monje M, Jansen MHA, Sewing ACP, Lagerweij T, Vuchts DJ, van Vuurden DG, Caretti V, Wesseling P, Kaspers GJL, Hulleman E, Cohen K, Raabe E, Pearl M, Kogiso M, Zhang L, Qi L, Lindsay H, Lin F, Berg S, Li XN, Muscal J, Amayiri N, Tabori U, Campbel B, Bakry D, Aronson M, Durno C, Gallinger S, Malkin D, Qaddumi I, Musharbash A, Swaidan M, Bouffet E, Hawkins C, Al-Hussaini M, Rakopoulos P, Shandilya S, McCully C, Murphy R, Akshintala S, Cole D, Macallister RP, Cruz R, Widemann B, Warren K, Salloum R, Smith A, Glaunert M, Ramkissoon A, Peterson S, Baker S, Chow L, Sandgren J, Pfeifer S, Popova S, Alafuzoff I, de Stahl TD, Pietschmann S, Kerber MJ, Zwiener I, Henke G, Kortmann RD, Muller K, von Bueren A, Sieow NYF, Hoe RHM, Tan AM, Chan MY, Soh SY, Hawkins C, Burrell K, Chornenkyy Y, Remke M, Golbourn B, Buczkowicz P, Barzczyk M, Taylor M, Rutka J, Dirks P, Zadeh G, Agnihotri S, Hashizume R, Ihara Y, Andor N, Chen X, Lerner R, Huang X, Tom M, Solomon D, Mueller S, Petritsch C, Zhang Z, Gupta N, Waldman T, James D, Dujua A, Co J, Hernandez F, Doromal D, Hegde M, Wakefield A, Brawley V, Grada Z, Byrd T, Chow K, Krebs S, Heslop H, Gottschalk S, Yvon E, Ahmed N, Truffaux N, Philippe C, Cornilleau G, Paulsson J, Andreiuolo F, Guerrini-Rousseau L, Puget S, Geoerger B, Vassal G, Ostman A, Grill J, Parsons DW, Lin F, Trevino LR, Gao F, Shen X, Hampton O, Lindsay H, Kosigo M, Qi L, Baxter PA, Su JM, Chintagumpala M, Dauser R, Adesina A, Plon SE, Li XN, Wheeler DA, Lau CC, Pietsch T, Gielen G, Muehlen AZ, Kwiecien R, Wolff J, Kramm C, Lulla RR, Laskowski J, Goldman S, Gopalakrishnan V, Fangusaro J, Mackay A, Taylor K, Vinci M, Jones C, Kieran M, Fontebasso A, Papillon-Cavanagh S, Schwartzentruber J, Nikbakht H, Gerges N, Fiset PO, Bechet D, Faury D, De Jay N, Ramkissoon L, Corcoran A, Jones D, Sturm D, Johann P, Tomita T, Goldman S, Nagib M, Bendel A, Goumnerova L, Bowers DC, Leonard JR, Rubin JB, Alden T, DiPatri A, Browd S, Leary S, Jallo G, Cohen K, Prados MD, Banerjee A, Carret AS, Ellezam B, Crevier L, Klekner A, Bognar L, Hauser P, Garami M, Myseros J, Dong Z, Siegel PM, Gump W, Ayyanar K, Ragheb J, Khatib Z, Krieger M, Kiehna E, Robison N, Harter D, Gardner S, Handler M, Foreman N, Brahma B, MacDonald T, Malkin H, Chi S, Manley P, Bandopadhayay P, Greenspan L, Ligon A, Albrecht S, Pfister SM, Ligon KL, Majewski J, Gupta N, Jabado N, Hoeman C, Cordero F, Halvorson K, Hawkins C, Becher O, Taylor I, Hutt M, Weingart M, Price A, Nazarian J, Eberhart C, Raabe E, Kantar M, Onen S, Kamer S, Turhan T, Kitis O, Ertan Y, Cetingul N, Anacak Y, Akalin T, Ersahin Y, Mason G, Nazarian J, Ho C, Devaney J, Stampar M, Kambhampati M, Crozier F, Vezina G, Packer R, Hwang E, Gilheeney S, Millard N, DeBraganca K, Khakoo Y, Kramer K, Wolden S, Donzelli M, Fischer C, Petriccione M, Dunkel I, Afzal S, Carret AS, Fleming A, Larouche V, Zelcer S, Johnston DL, Kostova M, Mpofu C, Decarie JC, Strother D, Lafay-Cousin L, Eisenstat D, Fryer C, Hukin J, Bartels U, Bouffet E, Hsu M, Lasky J, Moore T, Liau L, Davidson T, Prins R, Fouladi M, Bartels U, Warren K, Hassal T, Baugh J, Kirkendall J, Doughman R, Leach J, Jones B, Miles L, Hawkins C, Bouffet E, Hargrave D, Grill J, Jones C, Jacques T, Savage S, Goldman S, Leary S, Packer R, Saunders D, Wesseling P, Varlet P, van Vuurden D, Wallace R, Flutter B, Morgenestern D, Hargrave D, Blanco E, Howe K, Lowdell M, Samuel E, Michalski A, Anderson J, Arakawa Y, Umeda K, Watanabe KI, Mizowaki T, Hiraoka M, Hiramatsu H, Adachi S, Kunieda T, Takagi Y, Miyamoto S, Venneti S, Santi M, Felicella MM, Sullivan LM, Dolgalev I, Martinez D, Perry A, Lewis PW, Allis DC, Thompson CB, Judkins AR. HIGH GRADE GLIOMAS AND DIPG. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Haindl S, Kidszun M, Oswald S, Hess C, Buchner B, Kolling S, Wilde L, Thersleff T, Yurchenko VV, Jourdan M, Hiramatsu H, Hosono H. Thin film growth of Fe-based superconductors: from fundamental properties to functional devices. A comparative review. Rep Prog Phys 2014; 77:046502. [PMID: 24695004 DOI: 10.1088/0034-4885/77/4/046502] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Fe-based superconductors bridge a gap between MgB2 and the cuprate high temperature superconductors as they exhibit multiband character and transition temperatures up to around 55 K. Investigating Fe-based superconductors thus promises answers to fundamental questions concerning the Cooper pairing mechanism, competition between magnetic and superconducting phases, and a wide variety of electronic correlation effects. The question addressed in this review is, however, is this new class of superconductors also a promising candidate for technical applications? Superconducting film-based technologies range from high-current and high-field applications for energy production and storage to sensor development for communication and security issues and have to meet relevant needs of today’s society and that of the future. In this review we will highlight and discuss selected key issues for Fe-based superconducting thin film applications. We initially focus our discussion on the understanding of physical properties and actual problems in film fabrication based on a comparison of different observations made in the last few years. Subsequently we address the potential for technological applications according to the current situation.
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Sakai N, Koizumi S, Yamashita S, Takehara Y, Sakahara H, Baba S, Oki Y, Hiramatsu H, Namba H. Arterial spin-labeled perfusion imaging reflects vascular density in nonfunctioning pituitary macroadenomas. AJNR Am J Neuroradiol 2013; 34:2139-43. [PMID: 23721898 DOI: 10.3174/ajnr.a3564] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Angiogenesis is very important in clinical features of pituitary adenomas. We investigated the relationship between the blood flow of nonfunctioning pituitary macroadenomas measured by arterial spin-labeled perfusion imaging and the microvessel attenuation of the tissue. MATERIALS AND METHODS Conventional MR imaging with contrast-enhanced T1WI and arterial spin-labeled perfusion imaging were performed before surgery in 11 consecutive patients with nonfunctioning pituitary macroadenomas. ROIs were drawn on the tumors, and the degrees of enhancement were calculated by dividing the signal intensity on the contrast-enhanced T1WI by that on the nonenhanced TIWI. As an index of tumor perfusion, a quantitative analysis was performed by using normalized tumor blood flow values calculated by dividing the mean value of the tumor region of interest by the mean region of interest values in the 2 cerebellar hemispheres. The relative microvessel attenuation was determined as the total microvessel wall area divided by the entire tissue area on CD-31-stained specimens. The degree of enhancement and the normalized tumor blood flow values were compared with relative microvessel attenuation. Additionally, intra- and postoperative tumor hemorrhages were visually graded. RESULTS The degree of enhancement was not correlated with relative microvessel attenuation. Statistically significant correlations were observed between normalized tumor blood flow values and relative microvessel attenuation (P < .05). At surgery, 3 cases were visually determined to be hypervascular tumors, and 1 of these cases had symptomatic postoperative hemorrhage. A statistically significant difference in normalized tumor blood flow values was observed visually between the intraoperative hypovascular and hypervascular groups (P < .05). CONCLUSIONS Arterial spin-labeled perfusion imaging reflects the vascular density of nonfunctioning pituitary macroadenomas, which may be useful in the preoperative prediction of intra- and postoperative tumor hemorrhage.
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Mori T, Kajihara K, Kanamura K, Toda Y, Hiramatsu H, Hosono H. Indium-Based Ultraviolet-Transparent Electroconductive Oxyfluoride InOF: Ambient-Pressure Synthesis and Unique Electronic Properties in Comparison with In2O3. J Am Chem Soc 2013; 135:13080-8. [DOI: 10.1021/ja405889m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsuya Mori
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji
192-0397, Japan
| | - Koichi Kajihara
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji
192-0397, Japan
| | - Kiyoshi Kanamura
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji
192-0397, Japan
| | - Yoshitake Toda
- Materials and Structures Laboratory & Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Hidenori Hiramatsu
- Materials and Structures Laboratory & Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Materials and Structures Laboratory & Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Ojima D, Chiba T, Shima K, Hiramatsu H, Hosono H, Hayashi K. Solid-state source of atomic oxygen for low-temperature oxidation processes: application to pulsed laser deposition of TiO2:N films. Rev Sci Instrum 2012; 83:023903. [PMID: 22380103 DOI: 10.1063/1.3683571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An atomic oxygen (AO) source has been redesigned to coordinate with a pulsed laser deposition system and used to grow nitrogen-doped TiO(2) films by deposition of TiN and simultaneous irradiation of the substrate with AO. The AO source uses an incandescently heated thin tube of zirconia as an oxygen permeation media to generate pure AO of low kinetic energy. The emission flux is calibrated using a silver-coated quartz crystal microbalance. The thin shape of the probe and transverse emission geometry of this emission device allow the emission area to be positioned close to the substrate surface, enhancing the irradiation flux at the substrate. AO irradiation is crucial for formation of TiO(2) phases via oxidation of the deposited TiN laser plume, and is effective for decrease of the substrate temperature for crystallization of anatase phase to as low as around 200 °C.
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Affiliation(s)
- Daiki Ojima
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-34, Nagatsuta 4259, Yokohama 226-8503, Japan
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Katase T, Ishimaru Y, Tsukamoto A, Hiramatsu H, Kamiya T, Tanabe K, Hosono H. Advantageous grain boundaries in iron pnictide superconductors. Nat Commun 2011; 2:409. [PMID: 21811238 PMCID: PMC3265378 DOI: 10.1038/ncomms1419] [Citation(s) in RCA: 218] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Accepted: 06/30/2011] [Indexed: 11/26/2022] Open
Abstract
High critical temperature superconductors have zero power consumption and could be used to produce ideal electric power lines. The principal obstacle in fabricating superconducting wires and tapes is grain boundaries-the misalignment of crystalline orientations at grain boundaries, which is unavoidable for polycrystals, largely deteriorates critical current density. Here we report that high critical temperature iron pnictide superconductors have advantages over cuprates with respect to these grain boundary issues. The transport properties through well-defined bicrystal grain boundary junctions with various misorientation angles (θ(GB)) were systematically investigated for cobalt-doped BaFe(2)As(2) (BaFe(2)As(2):Co) epitaxial films fabricated on bicrystal substrates. The critical current density through bicrystal grain boundary (J(c)(BGB)) remained high (>1 MA cm(-2)) and nearly constant up to a critical angle θ(c) of ∼9°, which is substantially larger than the θ(c) of ∼5° for YBa(2)Cu(3)O(7-δ). Even at θ(GB)>θ(c), the decay of J(c)(BGB) was much slower than that of YBa(2)Cu(3)O(7-δ).
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Affiliation(s)
- Takayoshi Katase
- Materials and Structures Laboratory, Mailbox R3-1, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Yoshihiro Ishimaru
- Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135-0062, Japan
| | - Akira Tsukamoto
- Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135-0062, Japan
| | - Hidenori Hiramatsu
- Materials and Structures Laboratory, Mailbox R3-1, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Materials and Structures Laboratory, Mailbox R3-1, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Keiichi Tanabe
- Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135-0062, Japan
| | - Hideo Hosono
- Materials and Structures Laboratory, Mailbox R3-1, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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Hiramatsu H, Kamiya T, Tohei T, Ikenaga E, Mizoguchi T, Ikuhara Y, Kobayashi K, Hosono H. Origins of Hole Doping and Relevant Optoelectronic Properties of Wide Gap p-Type Semiconductor, LaCuOSe. J Am Chem Soc 2010; 132:15060-7. [DOI: 10.1021/ja107042r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hidenori Hiramatsu
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Toshio Kamiya
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Tetsuya Tohei
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Eiji Ikenaga
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Teruyasu Mizoguchi
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Yuichi Ikuhara
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Keisuke Kobayashi
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
| | - Hideo Hosono
- Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan, Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan, SPring-8, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Hyogo 679-5198, Japan, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan,
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Miyakawa M, Hiramatsu H, Kamiya T, Hirano M, Hosono H. Fabrication and electron transport properties of epitaxial films of electron-doped 12CaO·7Al2O3 and 12SrO·7Al2O3. J SOLID STATE CHEM 2010. [DOI: 10.1016/j.jssc.2009.11.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Baily SA, Kohama Y, Hiramatsu H, Maiorov B, Balakirev FF, Hirano M, Hosono H. Pseudoisotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films. Phys Rev Lett 2009; 102:117004. [PMID: 19392231 DOI: 10.1103/physrevlett.102.117004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Indexed: 05/15/2023]
Abstract
We present resistivity measurements of the complete superconducting upper critical field (H{c2}) phase diagram as a function of angle (theta) and temperature (T) for cobalt-doped SrFe2As2 epitaxial films to 0.5 K and 50 T. Although H{c2}(theta) at 10 K is indistinguishable from that derived from a single-band anisotropy model, the apparent anisotropy H{c2}{ perpendicularc}/H{c2};{ parallelc} linearly decreases to 1 at low T, with H{c2}(0)=47 T. The data are well described by a two-band model with small, opposing anisotropies for the bands. This unusual relationship is confirmed by the observation of a local maximum for H{c2};{ parallelc} at low T.
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Affiliation(s)
- S A Baily
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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Watanabe T, Yanagi H, Kamiya T, Kamihara Y, Hiramatsu H, Hirano M, Hosono H. Nickel-Based Oxyphosphide Superconductor with a Layered Crystal Structure, LaNiOP. Inorg Chem 2007; 46:7719-21. [PMID: 17705374 DOI: 10.1021/ic701200e] [Citation(s) in RCA: 254] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A layered oxyphosphide, LaNiOP, was synthesized by solid-state reactions. This crystal was confirmed to have a layered structure composed of an alternating stack of (La(3+)O(2-))(+) and (Ni(2+)P(3-))(-). We found that the resulting LaNiOP shows a superconducting transition at approximately 3 K. This material exhibited metallic conduction and Pauli paramagnetism in the temperature range of 4-300 K. The resistivity sharply dropped to zero and the magnetic susceptibility became negative at <4 K, indicating that a superconducting transition occurs. 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.
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Affiliation(s)
- Takumi Watanabe
- Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, Japan
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Hiramatsu H, Negoro M, Hayakawa M, Sadatou A, Irie K, Uemura A, Kanno T, Sano K. Extracranial vertebral artery aneurysm associated with neurofibromatosis type 1. A case report. Interv Neuroradiol 2007; 13 Suppl 1:90-3. [PMID: 20566083 DOI: 10.1177/15910199070130s112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Accepted: 01/15/2007] [Indexed: 11/16/2022] Open
Abstract
SUMMARY Extracranial vertebral artery aneurysm associated with neurofibromatosis (NF1) is very rare. The aneurysm was successfully treated by endovascular trapping of the aneurysm and proximal vertebral artery with coils.
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Affiliation(s)
- H Hiramatsu
- Department of Neurosurgery, Fujita Health University School of Medicine, Toyoake, Japan -
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Masamune S, Sanpei A, Himura H, Ikezoe R, Onchi T, Nagata M, Hiramatsu H, Ishijima D. Research Plans for Low-Aspect Ratio Reversed Field Pinch. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Masamune
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - A. Sanpei
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - H. Himura
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - R. Ikezoe
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - T. Onchi
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - M. Nagata
- University of Hyogo, Himeji 671-2201, Japan
| | - H. Hiramatsu
- Technology Research Institute of Osaka Prefecture, Izumi 594-1157, Japan
| | - D. Ishijima
- Technology Research Institute of Osaka Prefecture, Izumi 594-1157, Japan
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Abstract
We report superconductivity in an iron-based layered oxy-pnictide LaOFeP. LaOFeP is composed of an alternate stack of lanthanum oxide (La3+O2-) and iron pnictide (Fe2+P3-) layers. Magnetic and electrical resistivity measurements verify the occurrence of the superconducting transition at approximately 4 K.
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Affiliation(s)
- Yoichi Kamihara
- ERATO-SORST, JST, Frontier Collaborative Research Center, Tokyo Institute of Technology, Mail Box S2-13, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Hiramatsu H, Ueda K, Kamiya T, Ohta H, Hirano M, Hosono H. Optical Properties and Two-Dimensional Electronic Structure in Wide-Gap Layered Oxychalcogenide: La2CdO2Se2. J Phys Chem B 2004. [DOI: 10.1021/jp048722q] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hidenori Hiramatsu
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Kazushige Ueda
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Toshio Kamiya
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hiromichi Ohta
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Masahiro Hirano
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Hosono Transparent Electro-Active Materials (TEAM) Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST) Agency, KSP C-1232, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
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Kamioka H, Hiramatsu H, Hirano M, Ueda K, Kamiya T, Hosono H. Quantum beat between two excitonic levels split by spin--orbit interactions in the oxychalcogenide LaCuOS. Opt Lett 2004; 29:1659-1661. [PMID: 15309851 DOI: 10.1364/ol.29.001659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Degenerate four-wave mixing signals excited by femtosecond laser pulses were measured in LaCuOCh (Ch = S and Se) at 4 K. The signals for LaCuOS exhibit a beat structure with a period of 480 fs just at the exciton peak energy, indicating that the lowest exciton states are split by 9 meV, but no beat structure was observed in LaCuOSe, regardless of the laser's energy. The spin--orbit interaction of the Ch ion accompanied by the hybridization of Cu 3d orbitals causes splitting of the exciton levels. Furthermore, the contribution of Ch p orbitals in the valence band maximum is larger in LaCuOSe owing to increased covalency in the Cu--Ch bond when S is replaced with Se.
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Affiliation(s)
- Hayato Kamioka
- Hosono Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Agency, KSP, Sakado, Takatsu-ku, Kawasaki, Japan.
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Kojima K, Fujii N, Omoto E, Nose S, Yoneyama M, Sugii Y, Hiramatsu H, Chikatsune M, Sato M, Takata S, Itoshima T, Tanimoto M. Cyclic thrombocytopenia and polycythemia vera. Ann Hematol 2003; 82:61-3. [PMID: 12574969 DOI: 10.1007/s00277-002-0580-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2002] [Accepted: 10/16/2002] [Indexed: 10/25/2022]
Abstract
A periodic fall of platelet number characterizes an acquired pathological condition named cyclic thrombocytopenia. We describe an unusual case of polycythemia vera in which the episodes of thrombocytopenia were followed regularly by thrombocytosis. The period of platelet count fluctuation was about 50 days, with the counts ranging from 34 to 820 x 10(9)/l. Bone marrow megakaryocytes were decreased in number during platelet nadir. Circulating thrombopoietin levels fluctuated out of phase with the platelet count. We suggest that at least some cases of polycythemia vera may have an unstable hematopoietic stem cell pool in nature, which could contribute to the development of unprovoked cyclic thrombocytopenia.
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Affiliation(s)
- K Kojima
- Department of Medicine II, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan.
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Kikuchi Y, Hiramatsu H, Seto H, Kita T. A rare case of advanced ovarian carcinoma who developed difficulty walking 25 days after treatment with weekly paclitaxel. Anticancer Drugs 2001; 12:631-3. [PMID: 11487721 DOI: 10.1097/00001813-200108000-00011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Although taxol has shown significant activity in advanced ovarian cancer, peripheral neuropathy is likely to become the major dose-limiting toxicity. We describe a case of advanced ovarian carcinoma who developed difficulty walking because of marked pain in the lower extremities and loss of proprioception 25 days after treatment with weekly taxol (80 mg/m(2)x3).
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Affiliation(s)
- Y Kikuchi
- Department of Obstetrics and Gynecology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama 359-8513, Japan.
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Hatsuda M, Hiramatsu H, Yamada S, Shimizu T, Seki M. A novel and facile racemization of chiral 1,1'-biaryl-2,2'-dicarboxylic acids. J Org Chem 2001; 66:4437-9. [PMID: 11397192 DOI: 10.1021/jo0101196] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M Hatsuda
- Product & Technology Development Laboratory and Discovery Research Laboratory, Tanabe Seiyaku Co., Ltd., 3-16-89, Kashima, Yodogawa-ku, Osaka 532-8505, Japan
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Ikeda T, Masamura S, Fujii H, Hiramatsu H, Mukai M, Matsui A, Hohjoh T, Kawaguchi M, Takayama S, Tokura H, Mitsui Y, Kitagawa Y, Kitajima M. Sentinel lymph node biopsy using tin colloid RI and blue dye method. Breast Cancer 2001; 7:284-6. [PMID: 11114851 DOI: 10.1007/bf02966391] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Axillary dissection has been considered essential for breast cancer staging because nodal metastasis is the most powerful predictive factor for recurrence. On the other hand, morbidity, such as lymphedema and shoulder dysfunction, may occur. Sentinel node biopsy is a good way to avoid unnecessary axillary dissection. We used tin colloid as a carrier of Tc99m tracer together with the blue dye method. The detection rate of the sentinel node was 27 cases out of 29 (90%) for the blue dye method, 10 cases out of 19 (53%) for the RI method, and 27 out of 33 (82%) for the combined method. The detection rate of the RI method was improved after adding the subcutaneous injection over the tumor from 45% before adding the subcutaneous injection to 82% after adding it. The false negative rate was 11% for the blue dye method, 0% for the RI method, and 10% for the combined method. This yields a sensitivity of 89% for the blue dye method, 100% for the RI method, and 90% for the combined method. Specificity was 100% for all three methods. Accuracy was 96% for the blue dye method, 100% for the RI method, and 96% for the combined method. There were two false negative cases. The average number of sentinel lymph nodes was 2.12 for the dye method, 1.66 for the RI method, and 1.95 for the combined method. There were three of 49 cases with identified parasternal lymph nodes by RI imaging. Lymphatic mapping using tin colloid may be useful for detecting sentinel nodes.
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Affiliation(s)
- T Ikeda
- Department of Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan
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