A5007232723- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Muon and positron interactions and applications
- Iron-based superconductors research
- Superconducting Materials and Applications
- Rare-earth and actinide compounds
- Nuclear Physics and Applications
- Theoretical and Computational Physics
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Superconductivity in MgB2 and Alloys
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Magnetic properties of thin films
- Particle Detector Development and Performance
- Ammonia Synthesis and Nitrogen Reduction
- Nuclear reactor physics and engineering
- Inorganic Chemistry and Materials
- High-pressure geophysics and materials
- Corporate Taxation and Avoidance
- Inorganic Fluorides and Related Compounds
- Organoboron and organosilicon chemistry
- Magnetic Properties of Alloys
- Organic and Molecular Conductors Research
TRIUMF
1992-2025
University of British Columbia
1992-2025
Osaka Metropolitan University
2023
Osaka Prefecture University
2018-2022
High Energy Accelerator Research Organization
2012-2021
The Graduate University for Advanced Studies, SOKENDAI
2011-2021
Japan Proton Accelerator Research Complex
2012-2021
Institute of Materials Structure Science
2014-2021
Chiba University
2021
Nippon Soken (Japan)
2020
A crossover with decreasing temperature $T$ from localized moment magnetism to heavy Fermi liquid behavior is reported for the metallic compound ${\mathrm{LiV}}_{2}{\mathrm{O}}_{4}$ fcc normal-spinel structure. At $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1\mathrm{K}$, electronic heat capacity coefficient $\ensuremath{\gamma}\ensuremath{\approx}0.42\mathrm{J}/\mathrm{mol}{\mathrm{K}}^{2}$ exceptionally large a transition metal compound, Wilson ratio $\ensuremath{\approx}1.7$, and...
We have performed transverse-field muon spin relaxation measurements of the Zn-substituted cuprate high- ${T}_{c}$ superconductors: ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}({\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Zn}}_{y}){\mathrm{O}}_{4}$ and ${\mathrm{YBa}}_{2}({\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Zn}}_{y}{)}_{3}{\mathrm{O}}_{6.63}$. The superconducting carrier density/effective mass ${n}_{s}/{m}^{*}$ ratio at $T\ensuremath{\rightarrow}0$ decreases with increasing Zn...
We have performed muon spin relaxation measurements of the frustrated kagom\'e lattice system Sr${\mathrm{Cr}}_{8}$${\mathrm{Ga}}_{4}$${\mathrm{O}}_{19}$. Our results demonstrate slowing down Cr fluctuations when cooling toward susceptibility-cusp temperature ${T}_{g}\ensuremath{\sim}3.5$ K. The saturation rate below ${T}_{g}$, together with its weak dependence on longitudinal field (LF) between 0 and 2 kG, indicates presence dynamic persisting even at $T\ensuremath{\sim}100$ mK without...
We investigated the optical spectrum of Ba(Fe1-xCox)2As2 single crystals with various doping levels. It is found that low-energy conductivity this system can be decomposed into two components: a sharp Drude term and broad "incoherent" term. For compounds showing magnetic order, gap appears predominantly in component, while an s-wave like superconducting opens both components for highly doped compounds. The weight steadily increases as proceeds, consistent electron system. On other hand,...
We report elastic neutron diffraction and muon spin relaxation ( $\ensuremath{\mu}\mathrm{SR}$) measurements of the quasi-one-dimensional antiferromagnets ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{3}$ ${\mathrm{Ca}}_{2}{\mathrm{CuO}}_{3}$, which have extraordinarily reduced ${T}_{N}/J$ ratios. observe almost resolution-limited antiferromagnetic Bragg reflections in obtain a ordered moment size $\ensuremath{\sim}0.06{\ensuremath{\mu}}_{\mathrm{B}}$. find that ratio...
The effect of disorder on the superconducting transition temperature ${T}_{c}$ cuprate superconductors is examined. Disorder introduced into cation sites in plane adjacent to ${\mathrm{CuO}}_{2}$ planes two single-layer systems, ${\mathrm{Bi}}_{2.0}{\mathrm{Sr}}_{1.6}{\mathrm{Ln}}_{0.4}{\mathrm{CuO}}_{6+\ensuremath{\delta}}$ and ${\mathrm{La}}_{1.85\ensuremath{-}y}{\mathrm{Nd}}_{y}{\mathrm{Sr}}_{0.15}{\mathrm{CuO}}_{4}$. controlled by changing rare earth (Ln) ions with a different ionic...
Zero-field muon spin relaxation and resistivity experiments on ${\mathrm{La}}_{0.67}$${\mathrm{Ca}}_{0.33}$Mn${\mathrm{O}}_{3}$ powder show that the sublattice magnetization ${\ensuremath{\nu}}_{\ensuremath{\mu}}(T)$ is well described for $T\ensuremath{\le}{T}_{c}$ by ${(1\ensuremath{-}\frac{T}{{T}_{c}})}^{\ensuremath{\beta}}$, where $\ensuremath{\beta}=0.345\ifmmode\pm\else\textpm\fi{}0.015$, characteristic of a second-order phase transition 3D system, ferromagnetic temperature...
We report muon spin relaxation $(\ensuremath{\mu}\mathrm{SR})$ measurements using single crystals of oxygen-intercalated stage-4 ${\mathrm{La}}_{2}{\mathrm{CuO}}_{4.11}$ (LCO:4.11) and ${\mathrm{La}}_{1.88}{\mathrm{Sr}}_{0.12}{\mathrm{CuO}}_{4}$ (LSCO:0.12), in which neutron scattering studies have found incommensurate magnetic Bragg reflections. In both systems, zero-field $\ensuremath{\mu}\mathrm{SR}$ show precession below the N\'eel temperature ${T}_{N}$ with frequency 3.6 MHz at...
The neutron instruments suite, installed at the spallation source of Materials and Life Science Experimental Facility (MLF) Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 beam ports 21 are in operation for user programs or under commissioning. A unique challenging instrumental suite been realized via combination a high-performance source, optimized scattering, using cutting-edge technologies. All are/will serve world-leading investigations broad range fields,...
The spin dynamics of geometrically frustrated pyrochlore antiferromagnets Y2Mo2O7 and Tb2Mo2O7 have been investigated using muon relaxation. A dramatic slowing down the moment fluctuations occurs as one approaches freezing temperatures (TF=22 K 25 respectively) from above. Below TF there is a disordered magnetic state similar to that found in glass but with residual relaxation rate at low temperatures. These results show large density states for excitations these systems near zero energy.
We present zero-field muon spin relaxation (\ensuremath{\mu}SR) measurements of ${\mathrm{La}}_{1.6\ensuremath{-}x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ with $x=0.125,0.15,0.2;{\mathrm{La}}_{1.475}{\mathrm{Nd}}_{0.4}{\mathrm{Ba}}_{0.125}{\mathrm{CuO}}_{4},{\mathrm{La}}_{1.875}{\mathrm{Ba}}_{0.125}{\mathrm{CuO}}_{4},$ and ${\mathrm{La}}_{1.875}{\mathrm{Ba}}_{0.125\ensuremath{-}y}{\mathrm{Sr}}_{y}{\mathrm{CuO}}_{4}$ $y=0.025,0.065.$ All the samples dopant concentrations...
We report the first observation of multilayer band splitting in optimally doped trilayer cuprate Bi2Sr2Ca2Cu3O(10+δ) (Bi2223) by angle-resolved photoemission spectroscopy. The observed energy bands and Fermi surfaces are originated from outer inner CuO2 planes (OP IP). OP is overdoped with a large d-wave gap around node Δ0∼43 meV while IP underdoped an even Δ0∼60 meV. These gaps much larger than those for same doping level double-layer cuprates, which leads to Tc Bi2223. propose possible...
A muon experimental facility, known as the Muon Science Establishment (MUSE), is one of user facilities at Japan Proton Accelerator Research Complex, along with those for neutrons, hadrons, and neutrinos. The MUSE facility integrated into Materials Life Facility building in which a high-energy proton beam that shared neutron experiment delivers variety beams research covering diverse scientific fields. In this review, we present current status MUSE, still process being developed its fully...
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It near-ideal two-body system for precision test bound-state theory fundamental symmetries. The MuSEUM collaboration performed new measurement the muonium ground-state hyperfine structure at J-PARC using high-intensity pulsed beam high-rate capable positron counter. resonance transition was successfully observed near-zero magnetic field, interval $ν_{\text{HFS}}$ = 4.463302(4) GHz obtained with relative...
Neutron scattering, magnetometry, and muon spin rotation ($\mu$SR) measurements were performed to investigate the magnetic order dynamics across ferromagnet-to-paramagnet transition in hole-doped Mott insulator Y$_{1-x}$Ca$_x$TiO$_3$. We find that proceeds through a volume-wise phase separation into ferromagnetic paramagnetic regions. Spin fluctuations with characteristic timescale of $\sim$ 0.1 $\mu$s, as detected via $\mu$SR, are observed appear at Ca concentrations $x \geq 0.10$. The...
Breathing pyrochlores are a unique class of materials characterized by three-dimensional lattice corner-sharing tetrahedra. However, unlike conventional where all tetrahedra identical in size, the breathing pyrochlore is composed alternating large and small Experimental realizations rare but they do occur $A$-site ordered spinels, as prototype LiGaCr$_4$O$_8$ LiInCr$_4$O$_8$. In this work, we demonstrate that Cr cannot be straightforwardly substituted with other magnetic transition metals...
We have examined the magnetic properties of frustrated kagom\'e lattice spin systems ${\mathrm{KFe}}_{3}$(OH${)}_{6}$(${\mathrm{SO}}_{4}$${)}_{2}$ (Fe-jarosite) and ${\mathrm{KCr}}_{3}$(OH${)}_{6}$(${\mathrm{SO}}_{4}$${)}_{2}$ (Cr-jarosite) using \ensuremath{\mu}SR technique. In Fe-jarosite, a clear muon precession signal in zero field was found below 55 K, corresponding to long-range order Fe moments. Cr-jarosite fluctuations persist without signature freezing even at T = 25 mK, far...
We report muon spin relaxation measurements of the doped spin-Peierls system $({\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x})\ensuremath{-}({\mathrm{Ge}}_{1\ensuremath{-}y}{\mathrm{Si}}_{y}){\mathrm{O}}_{3}$. Spontaneous precession in zero applied field was observed, confirming presence antiferromagnetic order this series compounds. In contrast to usual antiferromagnets, is accompanied by a signal indicating large spatial inhomogeneity ordered moment size. Assuming an exponential decay...
Effect of Diet on Liver Glutathione and Reductase Get access ETSUKO MARUYAMA, MARUYAMA From the Institute for Cancer Research, Osaka University Medical SchoolKita-ku, Search other works by this author on: Oxford Academic PubMed Google Scholar KATSUKO KOJIMA, KOJIMA TANEAKI HIGASHI, HIGASHI YUKIYA SAKAMOTO The Journal Biochemistry, Volume 63, Issue 3, March 1968, Pages 398–399, https://doi.org/10.1093/oxfordjournals.jbchem.a128788 Published: 01 1968 Article history Received: 18 September 1967
Oxygen molecules were found to enter into lead phthalocyanine single crystals by thermal diffusion when they annealed in an oxygen gas of atmospheric pressure above 230°C for more than ten hours. Diffusion constant is 7.2 ×10 -9 cm 2 sec -1 at 242°C with activation energy 1.4 eV. Dark conductivity σ increased three orders magnitude room temperature the heat treatment. Correspondingly, E defined σ∝exp (- / k T ) decreased from 0.85 0.54 The measurement thermoelectric power indicates that...