Jumpei Nakamura
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View article: Cu-spin Correlation in the Electron-overdoped High-Tc Cuprate Thin Films of La_2-x_Ce_x_CuO_4_ Probed by Low-energy Muons
Cu-spin Correlation in the Electron-overdoped High-Tc Cuprate Thin Films of La_2-x_Ce_x_CuO_4_ Probed by Low-energy Muons Open
We investigated the Cu-spin correlation in the overdoped regime of the electron-doped high-Tc cuprate thin films of La_2-x_Ce_x_CuO_4_, changing the reduction condition from muon spin relaxation using low-energy muons. The Cu-spin correlat…
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: On order isomorphisms of locally parallel sets between C⁎-algebras: The case of matrix algebras
On order isomorphisms of locally parallel sets between C⁎-algebras: The case of matrix algebras 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: Signatures of the quantum spin liquid state in triangular-based zig-zag polyaromatic hydrocarbon radicals
Signatures of the quantum spin liquid state in triangular-based zig-zag polyaromatic hydrocarbon radicals Open
The study reports the discovery of Cs(chrysene˙ − )(THF) 0.5 ·(THF) 0.25 , a pure-phase spin-½ organic magnet featuring triangular-based zigzag magnetic layers and exhibiting a quantum spin liquid state with gapless spin excitations.
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: Investigation of Superconducting Gap of High-Entropy Telluride AgInSnPbBiTe5
Investigation of Superconducting Gap of High-Entropy Telluride AgInSnPbBiTe5 Open
We performed transverse-field muon spin relaxation/rotation (TF- μ SR) on a high-entropy-type (HE-type) superconductor AgInSnPbBiTe 5 . The emergence of bulk superconducting states was confirmed from magnetic susceptibility, specific heat,…
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: Investigation of superconducting gap of high-entropy telluride AgInSnPbBiTe5
Investigation of superconducting gap of high-entropy telluride AgInSnPbBiTe5 Open
We performed transverse-field muon spin relaxation/rotation (TF-μSR) on a high-entropy-type (HE-type) superconductor AgInSnPbBiTe5. The emergence of bulk superconducting states was confirmed from magnetic susceptibility, specific heat, and…
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: 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: 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: 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: Present status of J-PARC MUSE
Present status of J-PARC MUSE Open
At J-PARC MUSE, since the µ SR2017 conference and up to FY2022, there have been several new developments at the facility, including the completion of a new experimental area S2 at the surface muon beamline S-line and the first muon beam ex…
View article: Intense Lyman-alpha light source for ultra-slow muon generation
Intense Lyman-alpha light source for ultra-slow muon generation Open
A small-momentum-width muon beam, so-called ultra-slow muon beam, can be generated by laser ionization of muonium. To realize efficient ultra-slow muon generation, the Lyman-alpha and below 360 nm coherent light are required to resonantly …
View article: Short-range spin order in paramagnetic AgCrSe2
Short-range spin order in paramagnetic AgCrSe2 Open
Muon spin rotation (μSR) experiments were performed to directly investigate the temperature dependence of the short-range order or correlations of chromium spins in the paramagnetic phase of AgCrSe2. The detailed investigation of the μSR s…
View article: Erratum: “Hydrogen impurities in p-type semiconductors, GeS and GeTe” [J. Appl. Phys. 130, 195701 (2021)]
Erratum: “Hydrogen impurities in p-type semiconductors, GeS and GeTe” [J. Appl. Phys. 130, 195701 (2021)] Open
First Page
View article: Perspective of Muon Production Target at J-PARC MLF MUSE
Perspective of Muon Production Target at J-PARC MLF MUSE Open
View article: Transportation of Ultra Slow Muon on U-line, MLF, J-PARC
Transportation of Ultra Slow Muon on U-line, MLF, J-PARC Open
View article: J-PARC Muon Facility, MUSE
J-PARC Muon Facility, MUSE Open
At J-PARC MUSE (Muon Science Establishment), one graphite target was installed in the proton beam line on the way to the neutron source, from which four sets of the secondary lines were designed to be extracted and extended into two experi…
View article: Publisher’s Note: “Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture” [AIP Advances 6, 095018 (2016)]
Publisher’s Note: “Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture” [AIP Advances 6, 095018 (2016)] Open
First Page
View article: Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture
Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture Open
We develop a set of analytical approximations for the estimation of the combined effect of various photoionization processes involved in the resonant four-wave mixing generation of ns pulsed Lyman-α (L-α) radiation by using 212.556 nm and …
View article: High-efficiency generation of pulsed Lyman-α radiation by resonant laser wave mixing in low pressure Kr-Ar mixture
High-efficiency generation of pulsed Lyman-α radiation by resonant laser wave mixing in low pressure Kr-Ar mixture Open
We report an experimental generation of ns pulsed 121.568 nm Lyman-α radiation by the resonant nonlinear four-wave mixing of 212.556 nm and 845.015 nm radiation pulses providing a high conversion efficiency 1.7x10-3 with the out…
View article: Tuning of Ultra-Slow Muon Transport System
Tuning of Ultra-Slow Muon Transport System Open
The ultra-slow muon beam is expected to be a new probe for surface and interface physics.A new beamline for the ultra-slow muon is now under construction at the J-PARC.Before transporting ultra-slow muons through the transport system, we t…
View article: Tuning of the ultra slow muon beamline by utilizing ionized hydrogen.
Tuning of the ultra slow muon beamline by utilizing ionized hydrogen. Open
The ultra-slow muon beam is expected to be a new probe for surface and interface physics.A new beamline for the ultra-slow muon is now under construction at the J-PARC.Before transporting ultra-slow muons through the transport system, we t…