Tetsuya Takeuchi
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View article: Role of Vanadium-Oxide Layer in Electronic State of Sr<sub>2</sub>VFeAsO<sub>3−</sub><i><sub>δ</sub></i> with Oxygen Deficiency
Role of Vanadium-Oxide Layer in Electronic State of Sr<sub>2</sub>VFeAsO<sub>3−</sub><i><sub>δ</sub></i> with Oxygen Deficiency Open
Iron-based superconductor Sr$_2$VFeAsO$_3$ is composed of alternate stacking of a superconducting FeAs layer and an insulating vanadium-oxide layer with a perovskite-type structure. Electronic orders stemming from the spin and orbital degr…
View article: Investigation of emission plane control in GaInN/GaN multiple-quantum shells for efficient nanowire-based LEDs
Investigation of emission plane control in GaInN/GaN multiple-quantum shells for efficient nanowire-based LEDs Open
To improve the emission properties of multiple-quantum-shells nanowire-based LEDs, we assessed the effect of GaInN/GaN superlattices grown at varying growth temperatures, as well as the control of emission plane via p-GaN shell and emissio…
View article: Fabrication of vertical AlGaN-based ultraviolet-B laser diodes using a laser lift-off method
Fabrication of vertical AlGaN-based ultraviolet-B laser diodes using a laser lift-off method Open
Vertical AlGaN-based UV-B laser diodes were fabricated by a laser lift-off method to exfoliate sapphire substrates. These devices were processed on 1 cm 2 square wafers with a polycrystalline sintered AlN substrate as a structural support …
View article: Multi-hole coupling power monitor with tapered sub-waveguide for dual-frequency high-power gyrotron
Multi-hole coupling power monitor with tapered sub-waveguide for dual-frequency high-power gyrotron Open
In magnetically confined fusion plasmas, a gyrotron is an essential auxiliary heating device for generating and sustaining plasma through electron cyclotron resonance heating owing to its ability to generate high-power microwaves. Microwav…
View article: Improvement of Algan Homoepitaxial Tunnel Junction Deep-UV Light-Emitting Diodes by Controlling the Growth of N-Type Algan and Polycrystalline Mgzno/Al Electrodes
Improvement of Algan Homoepitaxial Tunnel Junction Deep-UV Light-Emitting Diodes by Controlling the Growth of N-Type Algan and Polycrystalline Mgzno/Al Electrodes Open
Deep-ultraviolet (UV) light-emitting diodes (LEDs) based on AlGaN crystals have low light-emission efficiency; therefore, there is a need to improve this light-emission efficiency for a wide range of applications such as water and air ster…
View article: Improvement of Algan Homoepitaxial Tunnel Junction Deep-UV Light-Emitting Diodes by Controlling the Growth of N-Type Algan and Polycrystalline Mgzno/Al Electrodes
Improvement of Algan Homoepitaxial Tunnel Junction Deep-UV Light-Emitting Diodes by Controlling the Growth of N-Type Algan and Polycrystalline Mgzno/Al Electrodes Open
Deep-ultraviolet (UV) light-emitting diodes (LEDs) based on AlGaN crystals have low light-emission efficiency; therefore, there is a need to improve this light-emission efficiency for a wide range of applications such as water and air ster…
View article: Anomalous Hall Effect in Antiferromagnet EuNiGe<sub>3</sub> with the Rashba-type Tetragonal Structure
Anomalous Hall Effect in Antiferromagnet EuNiGe<sub>3</sub> with the Rashba-type Tetragonal Structure Open
EuTGe 3 (T: transition metal) crystallizes in the so-called Rashba-type noncentrosymmetric tetragonal structure.Eu ions are divalent and order antiferromagnetically, with the helical magnetic structure.EuNiGe 3 is such a compound with a Né…
View article: Fermi Surfaces and Magnetoresistances of Dirac Conduction Electrons in PbX (X: S, Se, Te) and AMnBi<sub>2</sub> (A = Ca, Sr)
Fermi Surfaces and Magnetoresistances of Dirac Conduction Electrons in PbX (X: S, Se, Te) and AMnBi<sub>2</sub> (A = Ca, Sr) Open
We clarified the Fermi surface properties from the de Haas-van Alphen (dHvA) experiment and also carried out the magnetoresistance measurement in magnetic fields up to 500 kOe for cubic PbX (X: S, Se, Te) and tetragonal AMnBi 2 (A: Ca, Sr)…
View article: Single Crystal Growth and Ferromagnetism of New Compound EuCu<sub>1+</sub><i><sub>δ</sub></i>P<sub>1+</sub><i><sub>δ</sub></i> (<i>δ</i> = 0.425)
Single Crystal Growth and Ferromagnetism of New Compound EuCu<sub>1+</sub><i><sub>δ</sub></i>P<sub>1+</sub><i><sub>δ</sub></i> (<i>δ</i> = 0.425) Open
EuCu 1.74 P 2 (EuCu 1.75 P 2 ) were reported to crystallize in the ThCr 2 Si 2 -type tetragonal structure and to order ferromagnetically below a Curie temperature T C = 51 K.We tried to grow single crystals of EuCu 2 P 2 or EuCu 1.74 P 2 (…
View article: Magnetic and Fermi Surface Properties of EuAu<sub>5</sub> and EuCu<sub>5</sub>
Magnetic and Fermi Surface Properties of EuAu<sub>5</sub> and EuCu<sub>5</sub> Open
EuAu 5 with the hexagonal structure is known to be a ferromagnet with the Curie temperature T C = 13 K or 14 K.We succeeded in growing high-quality single crystals by the Bridgman method using the Mo crucible.The residual resistivity ρ 0 a…
View article: De Haas–van Alphen Effect and Fermi Surface Properties of Antiferromagnet EuSnP
De Haas–van Alphen Effect and Fermi Surface Properties of Antiferromagnet EuSnP Open
EuSnP with the tetragonal structure is known to be an antiferromagnet with a Néel temperature T N = 21 K.The first-order-like antiferromagnetic transition and a sharp metamagnetic transition at H m = 20 kOe in the magnetization curve at 2 …
View article: Discovery of superconductivity in quasicrystal
Discovery of superconductivity in quasicrystal Open
Superconductivity is ubiquitous as evidenced by the observation in many crystals including carrier-doped oxides and diamond. Amorphous solids are no exception. However, it remains to be discovered in quasicrystals, in which atoms are order…
View article: Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants Open
We study the electronic structure of Tsai-type cluster-based quasicrystalline\napproximants, Au$_{64}$Ge$_{22}$Yb$_{14}$ (AGY-I),\nAu$_{63.5}$Ge$_{20.5}$Yb$_{16}$ (AGY-II), and Zn$_{85.4}$Yb$_{14.6}$ (Zn-Yb),\nby means of photoemission spe…
View article: Neutron Scattering Study in Breathing Pyrochlore Antiferromagnet Ba<sub>3</sub>Yb<sub>2</sub>Zn<sub>5</sub>O<sub>11</sub>
Neutron Scattering Study in Breathing Pyrochlore Antiferromagnet Ba<sub>3</sub>Yb<sub>2</sub>Zn<sub>5</sub>O<sub>11</sub> Open
Inelastic neutron scattering (INS) study on breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 is presented. Observed crystalline electric field (CEF) excitations are explained by a Hamiltonian of Kramers ion Yb3+ of which the local symmetr…
View article: Distribution of 1,2-dichloropropane in blood and other tissues of rats after oral administration
Distribution of 1,2-dichloropropane in blood and other tissues of rats after oral administration Open
The present investigation was undertaken to determine the distribution of 1,2-dichloropropane (DCP) in the blood, liver, kidney, lung, and abdominal fat of rats after oral administration. Male rats were orally administered 62 or 125 mg/kg …
View article: Thirteen-week study of toxicity of fiber-like multi-walled carbon nanotubes with whole-body inhalation exposure in rats
Thirteen-week study of toxicity of fiber-like multi-walled carbon nanotubes with whole-body inhalation exposure in rats Open
Cancer development due to fiber-like straight type of multi-walled carbon nanotubes (MWCNTs) has raised concerns for human safety because of its shape similar to asbestos. To set concentrations of MWCNT for a rat carcinogenicity study, we …
View article: Additional file 1: Figure S1. of Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats
Additional file 1: Figure S1. of Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats Open
Blue arrows indicate the flow of the MWNT-7. Red arrows indicate aerosolization of the MWNT-7 by the upward spiraling airstream. MWNT-7 (Bulk MWNT-7) is first placed into the dust feeder. The dust feeder transports a portion of the MWNT-7 …
View article: Additional file 2: Table S1. of Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats
Additional file 2: Table S1. of Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats Open
Number of Rats Examined for Lung Histopathology, BALF and Lung Burden. (XLSX 13 kb)
View article: Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats
Lung carcinogenicity of inhaled multi-walled carbon nanotube in rats Open
There is clear evidence that MWNT-7 is carcinogenic to the lungs of male and female F344 rats, however no plural mesothelioma was observed.
View article: Mass Enhancement of Nearly Trivalent Compound EuCo<sub>2</sub>Si<sub>2</sub>: Studied by the de Haas-van Alphen Experiments and Energy Band Calculations
Mass Enhancement of Nearly Trivalent Compound EuCo<sub>2</sub>Si<sub>2</sub>: Studied by the de Haas-van Alphen Experiments and Energy Band Calculations Open
We succeeded in growing single crystals of EuCo2Si2 by the Bridgman method, and carried out the de Haas-van Alphen (dHvA) experiments. EuCo2Si2 was previously studied from a viewpoint of the trivalent electronic state on the basis of the m…
View article: Fermi Surface Properties of Eu-Divalent and Eu-Trivalent Electronic States with the AuCu<sub>3</sub>-type Cubic Structure
Fermi Surface Properties of Eu-Divalent and Eu-Trivalent Electronic States with the AuCu<sub>3</sub>-type Cubic Structure Open
The electronic states in EuBi3 and EuPd3 are known to be Eu-divalent and Eu- trivalent, respectively, from the previous studies using polycrystal samples. In the present study, we succeeded in growing high-quality single crystals, and carr…
View article: Single crystal growth and magnetic properties of RCu<sub>9</sub>Sn<sub>4</sub>(R: rare earth metals)
Single crystal growth and magnetic properties of RCu<sub>9</sub>Sn<sub>4</sub>(R: rare earth metals) Open
We succeeded in growing single crystals of tetragonal RCu9Sn4 (R=La, Ce, Pr, and Eu) by the Sn-self-flux method for the first time, and studied the electrical and magnetic properties of these compounds. The magnetism of CeCu9Sn4 and PrCu9S…