35 citations · 116 across the 23 of their papers we have counts for
23 papers
Metallurgy, superconductivity, and hardness of a new high-entropy alloy superconductor Ti-Hf-Nb-Ta-Re
Takuma Hattori, Yuto Watanabe, Terukazu Nishizaki +5
We explored quinary body-centered cubic (bcc) high-entropy alloy (HEA) superconductors with valence electron concentrations (VECs) ranging from 4.6 to 5.0, a domain that has receiv…
Datasets on materials research of hard ferromagnet in TM-Fe-Si (TM=Ti, Zr, Hf, V, Nb, and Ta) ternary systems
Ryusei Ishibashi, Jiro Kitagawa
The datasets presented in this article are related to materials research on hard ferromagnet in TM-Fe-Si (TM=Ti, Zr, Hf, V, Nb, and Ta) ternary systems. The motivation for data col…
Magnetic properties, electrical resistivity, and hardness of high-entropy alloys FeCoNiPd and FeCoNiPt
Jiro Kitagawa
We report the magnetic properties, electrical resistivity, and Vickers microhardness of as-cast and annealed high-entropy alloys (HEAs) FeCoNiPd and FeCoNiPt with the face-centered…
Superconductivity and hardness of the equiatomic high-entropy alloy HfMoNbTiZr
Jiro Kitagawa, Kazuhisa Hoshi, Yuta Kawasaki +3
We have found that body-centered cubic (bcc) HfMoNbTiZr is a type-II BCS high-entropy alloy (HEA) superconductor with a superconducting critical temperature of =4.1 K…
Fully-gapped superconducting state in interstitial-carbon-doped Zr5Pt3
T. Shang, J. Philippe, X. Y. Zhu +6
We report a comprehensive study of the ZrPtC superconductors, with interstitial carbon comprised between 0 and 0.3. At a macroscopic level, their superconductivity, wit…
Superconductivity in Al-Nb-Ti-V-Zr multicomponent alloy
Yuta Harayama, Jiro Kitagawa
The superconducting high-entropy alloys (HEAs) recently attract considerable attention due to their exciting properties, such as the robustness of superconductivity against atomic…
Cutting edge of high-entropy alloy superconductors from the perspective of materials research
Jiro Kitagawa, Shusuke Hamamoto, Naoki Ishizu
High-entropy alloys (HEAs) are a new class of materials which are being energetically studied around the world. HEAs are characterized by a multi-component alloy in which five or m…
Trial of a search for a face-centered-cubic high-entropy alloy superconductor
Naoki Ishizu, Jiro Kitagawa
With the aim of the discovery of face-centered-cubic (fcc) high-entropy alloy (HEA) superconductor, we have carried out materials research on Nb or Pb-containing multi-component al…
Competition between ferromagnetic and antiferromagnetic states in Al8.5-xFe23Ge12.5+x (0<=x<=3)
Jiro Kitagawa, Genta Yakabe, Akinori Nakayama +2
Polycrystalline Al7+xFe23Ge14-x-type orthorhombic Al8.5-xFe23Ge12.5+x (0<=x<=3) compounds were studied by X-ray diffraction measurement, metallographic examination, and magnetizati…
Multiple- to single-gap superconductivity crossover in NbIrPtO alloys
Y. Xu, S. Jöhr, L. Das +5
By using mostly the muon-spin rotation/relaxation (SR) technique, we investigate the superconductivity (SC) of NbIrPtO ( and 1.6) alloys, with $T_c = 10.5…
Superconductivity in Nb5Ir3-xPtxO
Jiro Kitagawa, Shusuke Hamamoto
We have investigated the superconducting critical temperature Tc of solid solution Nb5Ir3-xPtxO with the Ti5Ga4-type structure. The both end-members of Nb5Ir3O and Nb5Pt3O are repo…
New high-entropy alloy superconductor HfNbTiVZr
Naoki Ishizu, Jiro Kitagawa
High-entropy alloys are a new class of alloys, and attract much attention due to their unique properties. Since the discovery of a superconducting high-entropy alloy (HEA) in 2014,…
Teaching electromagnetism through demonstration of a practical application involving learning content from multiple disciplines
Jiro Kitagawa
Teaching electromagnetism by demonstrating a practical application associated with learning content is an important teaching technique. Demonstrations are often performed through v…
Superconductivity in oxygen-added Zr5Pt3
Shusuke Hamamoto, Jiro Kitagawa
Mn5Si3-type structure has been offering an interstitial chemistry. Recent report of enhancement of superconductivity in a Nb-based Mn5Si3-type compound by addition of an interstiti…
New room-temperature ferromagnet: B-added Pd0.75Mn0.25 alloy
Jiro Kitagawa, Kohei Sakaguchi
Mn-based room-temperature ferromagnets attract considerable attention due to their high ordered Mn moment. We have found that a Pd0.75Mn0.25 alloy with added B (Pd0.75Mn0.25Bx) sho…
Hill plot focusing on Ce compounds with high magnetic-ordering-temperatures and consequent study of Ce2AuP3
Junya Miyahara, Naoki Shirakawa, Yuta Setoguchi +3
Hill plot is a well-known criterion of the f-electron element interatomic threshold-distance separating the nonmagnetic state from the magnetic one in actinides or lanthanides. We…
Illumination effect by visible continuous-wave laser on bulk 40 K-superconductors
Jiro Kitagawa, Tatsuya Yoshika, Nobuhiro Gonda
Visible CW (continuous wave) -laser heating effects on the bulk superconductors CeFeAsO0.65F0.35 and MgB2 with 1.5 mm thickness have been investigated by measuring the temperature…
Optical, transport and magnetic properties of new compound CeCd3P3
Shohei Higuchi, Yuki Noshima, Naoki Shirakawa +2
We have found that CeCdP crystallizes into a hexagonal ScAlC-type structure. The optical, transport and magnetic properties of CeCdP were invest…
Improved room-temperature-selectivity between Nd and Fe in Nd recovery from Nd-Fe-B magnet
Yusuke Kataoka, Taisuke Ono, Masami Tsubota +1
The sustainable society requires the recycling of rare metals. Rare earth Nd is one of rare metals, accompanying huge consumption especially in Nd-Fe-B magnets. Although the wet pr…
Photoinduced Kondo effect in CeZnP
Jiro Kitagawa, Daiki Kitajima, Kenji Shimokawa +1
The Kondo effect, which originates from the screening of a localized magnetic moment by a spin-spin interaction, is widely observed in non-artificial magnetic materials, artificial…
Hydrogenation of Nd-Fe-B magnet powder under a high pressure of hydrogen
Y. Kataoka, Y. Kawamoto, T. Ono +2
The hydrogenation of Nd2Fe14B under a high pressure of hydrogen has been investigated for the first time. At the heat-treatment temperature of 600 degree C, the almost complete dec…
Synthesis and physical properties of a new caged compound Ce3Pd20As6 of the C6Cr23-type structure
K. Orita, K. Uenishi, M. Tsubota +4
We have found that Ce3Pd20As6 crystallizes into a cubic C6Cr23-type structure. Combination of electron probe microanalysis of the chemical composition and Rietveld analysis of the…
Observation of Jonscher Law in AC Hopping Conduction of Electron-Doped Nanoporous Crystal 12CaO7Al2O3 in THz Frequency Range
H. Harimochi, J. Kitagawa, M. Ishizaka +4
We have performed terahertz time-domain spectroscopy of carrier-doped nanoporous crystal 12CaO7Al2O3 showing the Mott variable range hopping at room temperature. The real part of t…