A5005931315- Rare-earth and actinide compounds
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Particle physics theoretical and experimental studies
- Inorganic Chemistry and Materials
- Advanced Condensed Matter Physics
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Magnetic confinement fusion research
- Nuclear Materials and Properties
- Topological Materials and Phenomena
- Neutrino Physics Research
- 2D Materials and Applications
- Thermodynamic and Structural Properties of Metals and Alloys
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Magnetic properties of thin films
- Fusion materials and technologies
- High-pressure geophysics and materials
Tokyo Metropolitan University
2016-2025
Chiba University
2022-2025
Hyogo Brain and Heart Center
2025
AREA Science Park
2024
High Energy Accelerator Research Organization
2007-2022
Chiba University Hospital
2022
University of Toyama
2021
University of Miyazaki
2021
Japan Atomic Energy Agency
2011-2020
Advanced Science Research Center
2011-2020
We report the discovery of pressure-induced superconductivity in an antiferromagnet CeIrSi 3 , which lacks inversion symmetry tetragonal crystal structure. The Néel temperature T N = 5.0 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero about 2.5 GPa. Superconductivity appears a wide region from 1.8 GPa to 3.5 GPa, relatively large superconduting transition sc 1.6 upper critical field H c2 (0) 11.1 indicating heavy-fermion superconductivity.
We report the analysis of spatial energy distribution data for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons}$ obtained with MARK-J detector at PETRA. define quantity "oblateness" to describe flat shape configuration and three-jet structure which is unambiguously observed first time. Our can be explained by quantum chromodynamic predictions production quark-antiquark pairs accompanied hard noncollinear gluons.
The mysterious hidden-order phase of a heavy-fermion compound may be an electronic nematic state.
We have investigated the resistivity $(\ensuremath{\rho}),$ thermoelectric power (TEP), and Hall coefficient ${(R}_{H})$ on high-quality single crystals of $R{\mathrm{Fe}}_{4}{\mathrm{P}}_{12}.$ TEP in ${\mathrm{CeFe}}_{4}{\mathrm{P}}_{12}$ is extremely large $(\ensuremath{\sim}0.5$ mV/K at 290 K) with a peak $\ensuremath{\sim}0.75$ around 65 K. The mobility also shows $\ensuremath{\sim}65$ K, suggesting carriers heavy masses developed lower temperatures related to f-hybridized band. Both Pr...
We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number unprecedented superconducting properties. The uniqueness is best highlighted by peculiar field dependence conductivity including first-order transition at Hc2 with reduction entropy flow. This consequence multiband superconductivity compensated electronic structure in hidden order state this system. provide strong evidence for new type unconventional two distinct gaps having different...
Magnetoresistivity measurements with fine tuning of the field direction on high quality single crystals ferromagnetic superconductor UCoGe show anomalous anisotropy upper critical H c2 . for ∥ b -axis ( ) in orthorhombic crystal structure is strongly enhanced decreasing temperature an S-shape and reaches nearly 20 T at 0 K. The dependence a shows upward curvature low value exceeding 30 T, while c K very small (∼0.6 T). Contrary to conventional ferromagnets, decrease Curie increasing marked...
Shubnikov-de Haas measurements of high quality URu2Si2 single crystals reveal two previously unobserved Fermi surface branches in the so-called hidden order phase. Therefore about 55% enhanced mass is now detected. Under pressure antiferromagnetic state, frequencies for magnetic fields applied along crystalline c axis show little change compared with zero data. This implies a similar both and states, which strongly suggests that lattice doubling phase due to ordering vector QAF = (0 0 1)...
Specific heat and magnetization measurements have been performed on high-quality single crystals of filled skutterudite ${\mathrm{PrFe}}_{4}{\mathrm{P}}_{12}$ in order to study the high-field heavy-fermion state (HFS) low-field ordered (ODS). From a broad hump observed $C/T$ vs T HFS for magnetic fields applied along $〈100〉$ direction, Kondo temperature $\ensuremath{\sim}9\mathrm{K}$ existence ferromagnetic Pr-Pr interactions are deduced. The ${}^{141}\mathrm{Pr}$ nuclear Schottky...
This special topic describes the contents of an L mode database that has been compiled with data from Alcator C-Mod, ASDEX, DIII, DIII-D, FTU, JET, JFT-2M, JT-60, PBX-M, PDX, T-10, TEXTOR, TFTR and Tore Supra. The consists a total 2938 entries, 1881 which are in phase while 922 ohmically heated only (ohmic). Each entry contains up to 95 descriptive parameters, including global kinetic information, machine conditioning configuration. presents description variables contained therein, it also...
We report on novel antiferromagnetic (AFM) and superconducting (SC) properties of noncentrosymmetric CePt3Si through measurements the 195Pt nuclear spin-lattice relaxation rate 1/T(1). In normal state, temperature (T) dependence 1/T(1) unraveled existence low-lying levels in crystal-electric-field multiplets formation a heavy-fermion (HF) state. The coexistence AFM SC phases that emerge at T(N)=2.2 K T(c)=0.75 K, respectively, takes place microscopic level. is first HF superconductor reveals...
We report the de Haas--van Alphen (dHvA) experiment on filled skutterudite ${\mathrm{PrFe}}_{4}{\mathrm{P}}_{12}$ exhibiting apparent Kondo-like behaviors in transport and thermal properties. have found enormously enhanced cyclotron effective mass ${m}_{\mathrm{c}}^{*}=81{m}_{0}$ high field phase, which indicates that is first Pr compound really heavy has been unambiguously confirmed. Also low nonmagnetic ordered phase (LOP), we observed dHvA branch with ${m}_{\mathrm{c}}^{*}=10{m}_{0}$...
The ITER Threshold Database, which at present comprises data from nine divertor tokamaks, is described. main results are presented and discussed. properties dependences of the power threshold in individual devices reviewed. In particular, analysis shows a rather general linear dependence on magnetic field, but non-monotonic density that varies device to device. Investigation combined database suggests P thres approximately=0.3n e B T 2.5 reasonable agreement with data. This expression yields...
We succeeded in growing a new transuranium compound NpPd 5 Al 2 with the tetragonal crystal structure by Pb-flux method, and measured electrical resistivity, specific heat, magnetic susceptibility magnetization. is found to be paramagnetic heavy-fermion superconductor strong coupling Δ C /γ T c = 2.33 [ =4.9 K γ= 200 mJ/(K ·mol)]. The upper critical field H c2 at 0 large highly anisotropic: (0) =37 kOe for ∥[100] =143 ∥[001]. strongly suppressed field, magnetization curve indicates step-like...
Resistivity and magnetostriction measurements were performed at high magnetic fields under pressure on UCoAl. At ambient pressure, the 1st order metamagnetic transition H m ∼0.7 T from paramagnetic ground state to field-induced ferromagnetic changes a crossover finite temperature 0 ∼11 K. With increasing linearly increases, while decreases is suppressed quantum critical endpoint (QCEP, P QCEP ∼1.5 GPa, ∼7 T). higher value of identified as continuously new anomaly appears above field * in...
Research on high-entropy-alloy (HEA) superconductors is a growing field in material science. In this study, we explored new HEA-type and discovered CuAl2-type superconductor Co0.2Ni0.1Cu0.1Rh0.3Ir0.3Zr2 with transition metal site. A superconducting was observed at 8.0 K after electrical resistivity, magnetization, specific heat measurements. The bulk characteristics of the superconductivity were confirmed through discovery will provide novel pathway to explore investigate relationship...
The magnetic skyrmions generated in a centrosymmetric crystal were recently first discovered ${\mathrm{Gd}}_{2}{\mathrm{PdSi}}_{3}$. In light of this, we observe the electronic structure by angle-resolved photoemission spectroscopy and unveil its direct relationship with magnetism this compound. Fermi surface band dispersions are demonstrated to have good agreement density functional theory calculations carried out careful consideration superstructure. Most importantly, find that...
We make the first report that a metallic pyrochlore oxide, Cd2Re2O7, exhibits type II superconductivity at 1.1 K. The oxide is known to be geometrically frustrated system, which includes tetrahedral network of magnetic ions. A large number compounds are classified in family oxides, and these exhibit wide variety physical properties ranging from insulator through semiconductor bad metal good metal. Until now, however, no has been reported for oxides. bulk this compound confirmed by...
This paper describes an update of the H mode confinement database that has been assembled for ITER project. Data were collected from six machines different sizes and shapes: ASDEX, DIII-D, JET, JFT-2M, PBX-M PDX. The updated contains better estimates fast ion energy content thermal times, discharges with RF heating, data using boronization, beryllium pellets, more systematic parameter scans, other features. list variables in expanded, selection criteria standard dataset have modified. We...
Electrical resistivity ($\rho$), magnetoresistance (MR), magnetization, thermopower and Hall effect measurements on the single crystal Gd$_{2}$PdSi$_3$, crystallizing in an AlB$_2$-derived hexagonal structure are reported. The well-defined minimum $\rho$ at a temperature above N\'eel (T$_N$= 21 K) large negative MR below $\sim$ 3T$_N$, reported earlier for polycrystals, reproducible even crystals. Such features generally uncharacteristic of Gd alloys. In addition, we also found interesting...
Single crystals of LaIrSi 3 and CeIrSi were grown by the Czochralski pulling method in a tetra-arc furnace magnetic superconducting properties, together with superconductivity CeIr 1- x Co Si , clarified measuring electrical resistivity, specific heat, susceptibility, magnetization de Haas–van Alphen (dHvA) effect. From results dHvA experiment for Fermi surface is found to split into two surfaces due spin–orbit interaction arising from non-centrosymmetric crystal structure, which are...
Describes the content of an H-mode confinement database that has been assembled for ITER project. Data were collected from six machines different sizes and shapes: ASDEX, DIII-D, JET, JFT-2M, PBX-M PDX. A detailed description criteria used in selection data definition each variables is given. The authors also present analysis conditions database, scalings (power law offset linear) with both dimensional dimensionless variables, predictions expected time
We grew single crystals of non-centrosymmetric compounds CeTSi 3 and CeTGe (T: transition metal), studied the magnetic properties by measuring electrical resistivity, susceptibility magnetization. also effect pressure on electronic states in antiferromagnets Co, Rh, Ir) resistivity under pressure. No noticeable change Néel temperature was observed up to 8 GPa CeRhGe CeIrGe , which are far from quantum critical point. On other hand, CeCoGe strongly decreased as a function pressure,...