A. Koda
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View article: Corrigendum to “Dynamics of polybutadiene reinforced with unsaturated carboxylate studied by muon spin relaxation (μSR)”[Polymer 105 (2016) 18856]
Corrigendum to “Dynamics of polybutadiene reinforced with unsaturated carboxylate studied by muon spin relaxation (μSR)”[Polymer 105 (2016) 18856] Open
View article: Phonon assisted ion diffusion in electrochemically cycled Na <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si27.svg" display="inline" id="d1e784"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> CoO <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si28.svg" display="inline" id="d1e792"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:math>
Phonon assisted ion diffusion in electrochemically cycled Na CoO Open
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View article: Superlong‐Range Magnetic Coupling and Ferromagnetic Spin Freezing in Mechanoluminescent Semiconductor Eu:SrAl<sub>2</sub>O<sub>4</sub>
Superlong‐Range Magnetic Coupling and Ferromagnetic Spin Freezing in Mechanoluminescent Semiconductor Eu:SrAl<sub>2</sub>O<sub>4</sub> Open
Magnetic transition in nonmetals requires the presence of a considerable proportion of magnetic spins. A new type of ferromagnet named dilute ferromagnetism that contradicts this well‐established concept is proposed for semiconductors of Z…
View article: Acceleration of Positive Muons by a Radio-Frequency Cavity
Acceleration of Positive Muons by a Radio-Frequency Cavity Open
Acceleration of positive muons from thermal energy to 100 keV has been demonstrated. Thermal muons were generated by resonant multiphoton ionization of muonium atoms emitted from a sheet of laser-ablated aerogel. The thermal muons were fir…
View article: Acceleration of Positive Muons by a Radio-Frequency Cavity
Acceleration of Positive Muons by a Radio-Frequency Cavity Open
Acceleration of positive muons from thermal energy to 100 keV has been demonstrated. Thermal muons were generated by resonant multiphoton ionization of muonium atoms emitted from a sheet of laser-ablated aerogel. The thermal muons were fir…
View article: Deciphering Transition Metal Diffusion in Anode Battery Materials: A Study on Nb Diffusion in Nb<sub><i>x</i></sub>Ti<sub>1−<i>x</i></sub>O<sub>2</sub>
Deciphering Transition Metal Diffusion in Anode Battery Materials: A Study on Nb Diffusion in Nb<sub><i>x</i></sub>Ti<sub>1−<i>x</i></sub>O<sub>2</sub> Open
Demand for fast‐charging lithium‐ion batteries (LIBs) has escalated incredibly in the past few years. A conventional method to improve the performance is to chemically partly substitute the transition metal with another to increase its con…
View article: U(1) Dirac quantum spin liquid candidate in triangular-lattice antiferromagnet CeMgAl11O19
U(1) Dirac quantum spin liquid candidate in triangular-lattice antiferromagnet CeMgAl11O19 Open
View article: Correlation between ferroelectricity and torsional motion of acetyl groups in tris(4-acetylphenyl)amine observed by muon spin relaxation
Correlation between ferroelectricity and torsional motion of acetyl groups in tris(4-acetylphenyl)amine observed by muon spin relaxation Open
It is demonstrated by muon spin relaxation and resonance experiments that the switchable spontaneous polarization of the organic ferroelectric compound tris(4-acetylphenyl)amine is governed by the local molecular dynamics of the acetyl gro…
View article: Revisiting the ion dynamics in Li <sub> <i>x</i> </sub> CoO <sub>2</sub> and Na <sub> <i>x</i> </sub> CoO <sub>2</sub>
Revisiting the ion dynamics in Li <sub> <i>x</i> </sub> CoO <sub>2</sub> and Na <sub> <i>x</i> </sub> CoO <sub>2</sub> Open
By combining operando muon spin spectroscopy and molecular dynamics simulations, this study reveals how ion size, electrostatic interactions, and crystal structure influence self-diffusion in layered Li x CoO 2 and Na x CoO 2 .
View article: Field-Induced Criticality in YbCu4Au
Field-Induced Criticality in YbCu4Au Open
YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder X-ray diff…
View article: Formation and structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>M</mml:mi><mml:mi>u</mml:mi><mml:mi>OH</mml:mi></mml:mrow></mml:math> in ice studied by muon spin rotation
Formation and structure of in ice studied by muon spin rotation Open
View article: Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network
Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network Open
Chiral superconductivity exhibits the formation of novel electron pairs that breaks the time-reversal symmetry and has been actively studied in various quantum materials in recent years. However, despite its potential to provide definitive…
View article: Slow polymer dynamics in poly(3-hexylthiophene) probed by muon spin relaxation
Slow polymer dynamics in poly(3-hexylthiophene) probed by muon spin relaxation Open
The molecular dynamics of regioregulated poly(3-hexylthiophene) P3HT is investigated using muon spin relaxation (μSR). The response of the μSR spectra to a longitudinal magnetic field (BLF, parallel to the initial muon spin direction) indi…
View article: Nonmagnetic Ground State in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Revealed by Muon Spin Rotation
Nonmagnetic Ground State in Revealed by Muon Spin Rotation Open
The magnetic ground state of single crystalline RuO_{2} was investigated by the muon spin rotation and relaxation (μSR) experiment. The spin precession signal due to the spontaneous internal magnetic field B_{loc}, which is expected in the…
View article: Annealing and doping effects on magnetism for T$$^{*}$$-type (La, Eu, Sr)$$_2$$CuO$$_{4-y}$$F$$_y$$ cuprates
Annealing and doping effects on magnetism for T$$^{*}$$-type (La, Eu, Sr)$$_2$$CuO$$_{4-y}$$F$$_y$$ cuprates Open
The magnetic behavior of T $$^{*}$$ -phase cuprates in the underdoped region has been studied through zero-field muon spin rotation/relaxation ( $$\mu $$ SR) measurements. By examining the manner in which the superconducting transiti…
View article: Pulsed muon facility of J-PARC MUSE
Pulsed muon facility of J-PARC MUSE Open
J-PARC Muon Facility: MUSE (Muon Science Establishment) is responsible for the inter-university user program and the operation, maintenance, and construction of the muon beamlines, namely D-line, S-line, U-line, and H-line, along with the …
View article: Sample Environment for Low Temperature μSR Experiments at MLF, J-PARC
Sample Environment for Low Temperature μSR Experiments at MLF, J-PARC Open
View article: Muon spin relaxation in mixed perovskite (LaAlO$$_3$$)$$_{x}$$(SrAl$$_{0.5}$$Ta$$_{0.5}$$O$$_3$$)$$_{1-x}$$ with $$x\simeq 0.3$$
Muon spin relaxation in mixed perovskite (LaAlO$$_3$$)$$_{x}$$(SrAl$$_{0.5}$$Ta$$_{0.5}$$O$$_3$$)$$_{1-x}$$ with $$x\simeq 0.3$$ Open
View article: Nanoscale dynamics of hydrogen in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>VO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> studied by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>μ</mml:mi><mml:mi>SR</mml:mi></mml:mrow></mml:math>
Nanoscale dynamics of hydrogen in studied by Open
Hydrogen dynamics in the nanoscale region of VO2 was investigated by muon spin rotation/relaxation (μSR) technique. Positively charged muon acts as a light radioisotope of protons and can be used as a probe to explore the inside of materia…
View article: Na-ion dynamics in the solid solution Na<sub><i>x</i></sub>Ca<sub>1−<i>x</i></sub>Cr<sub>2</sub>O<sub>4</sub> studied by muon spin rotation and neutron diffraction
Na-ion dynamics in the solid solution Na<sub><i>x</i></sub>Ca<sub>1−<i>x</i></sub>Cr<sub>2</sub>O<sub>4</sub> studied by muon spin rotation and neutron diffraction Open
Thermally activated Na diffusion mechanism in the honeycomb-like 1D channels of the solid solution Na x Ca 1− x Cr 2 O 4 .
View article: Quantum Criticality in YbCu4Ni
Quantum Criticality in YbCu4Ni Open
We report on the quantum criticality of YbCu$_4$Ni as revealed by our combined micro- and macro-measurements. We determine the crystal structure of YbCu$_4$Ni with site mixing by neutron diffraction measurements, which suggests the possibl…
View article: Author Correction: Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe2
Author Correction: Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe2 Open
View article: Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe2
Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe2 Open
LiCrSe 2 constitutes a recent valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets. In this work, we present a comprehensive study of the low temperature nuclear and magnetic structure established in thi…
View article: Magnetic Instability of Pr3Ru4Sn13
Magnetic Instability of Pr3Ru4Sn13 Open
We report on the quantum criticality of Pr$_3$Ru$_4$Sn$_{13}$ revealed by our new material research. Pr$_3$Ru$_4$Sn$_{13}$ has been synthesized by flux growth and characterized by single X-ray, powder X-ray, and powder neutron diffraction …
View article: Development of transient <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si45.svg" display="inline" id="d1e172"><mml:mi>μ</mml:mi></mml:math>SR method for high-flux pulsed muons
Development of transient SR method for high-flux pulsed muons Open
View article: Photo-excited charge carrier lifetime enhanced by slow cation molecular dynamics in lead iodide perovskite FAPbI3
Photo-excited charge carrier lifetime enhanced by slow cation molecular dynamics in lead iodide perovskite FAPbI3 Open
Using muon spin relaxation measurements on formamidinium lead iodide [FAPbI3, where FA denotes HC(NH2)2], we show that, among the five structurally distinct phases of FAPbI3 exhibited through two different temperature hysteresis, the reori…
View article: Persistent spin dynamics in magnetically ordered honeycomb cobalt oxides
Persistent spin dynamics in magnetically ordered honeycomb cobalt oxides Open
In the quest to find quantum spin liquids, layered cobalt oxides Na2Co2TeO6 and Na3Co2SbO6 have been proposed as promising candidates for approximating the Kitaev honeycomb model. Yet, their suitability has been thrown into question due to…
View article: Photo-excited charge carrier lifetime enhanced by slow cation molecular dynamics in lead iodide perovskite FAPbI$_3$
Photo-excited charge carrier lifetime enhanced by slow cation molecular dynamics in lead iodide perovskite FAPbI$_3$ Open
Using muon spin relaxation ($μ$SR) measurements on formamidinium lead iodide [FAPbI$_3$, where FA denotes HC(NH$_2)_2$] we show that, among the five structurally distinct phases of FAPbI$_3$ exhibited through two different temperature hyst…
View article: Direct observation of oxygen polarization in Sr$_2$IrO$_4$ by O $K$-edge x-ray magnetic circular dichroism
Direct observation of oxygen polarization in Sr$_2$IrO$_4$ by O $K$-edge x-ray magnetic circular dichroism Open
X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) measurements at the oxygen (O) $K$-edge were performed to investigate the magnetic polarization of ligand O atoms in the weak ferromagnetic (WFM) phase of the Ir pe…
View article: Local Magnetism in the Spin-singlet State of VO<sub>2</sub>
Local Magnetism in the Spin-singlet State of VO<sub>2</sub> Open