Kenji Nakajima
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View article: Acute myocardial infarction due to isolated spontaneous coronary artery dissection in the first septal branch: a case report
Acute myocardial infarction due to isolated spontaneous coronary artery dissection in the first septal branch: a case report Open
Background Myocardial infarction due to isolated spontaneous dissection in the septal branch of the coronary arteries is a rare cause of myocardial infarction with non-obstructive coronary artery disease and is challenging to diagnose. Cas…
View article: Magnetic evolution induced by freezing of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Ag</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> fluctuations in an intercalated transition metal dichalcogenide
Magnetic evolution induced by freezing of fluctuations in an intercalated transition metal dichalcogenide Open
View article: Development of an Anomaly Detection System for Rugby Match Based on Majority Rule Using Deep Neural Networks
Development of an Anomaly Detection System for Rugby Match Based on Majority Rule Using Deep Neural Networks Open
View article: Spin excitations arising from anisotropic Dirac spinons in YCu$_3$(OD)$_6$Br$_2$[Br$_{0.33}$(OD)$_{0.67}$]
Spin excitations arising from anisotropic Dirac spinons in YCu$_3$(OD)$_6$Br$_2$[Br$_{0.33}$(OD)$_{0.67}$] Open
A Dirac quantum spin liquid hosts Dirac spinons, which are low-energy fractionalized neutral quasiparticles with spin 1/2 that obey the Dirac equation. Recent inelastic neutron scattering studies have revealed a cone spin continuum in YCu$…
View article: Magnetic excitations in the noncentrosymmetric magnet Sr2MnSi2O7
Magnetic excitations in the noncentrosymmetric magnet Sr2MnSi2O7 Open
Magnetic excitations in the noncentrosymmetric magnet Sr$_2$MnSi$_2$O$_7$ were investigated through inelastic neutron scattering measurements. Major magnetic excitations are limited up to the energy transfer of 0.5 meV, and two magnon bran…
View article: Antiferromagnetism and Phase Stability of CrMnFeCoNi High-Entropy Alloy
Antiferromagnetism and Phase Stability of CrMnFeCoNi High-Entropy Alloy Open
It has long been suspected that magnetism could play a vital role in the phase stability of multicomponent high-entropy alloys. However, the nature of the magnetic order, if any, has remained elusive. Here, by using elastic and inelastic n…
View article: Quantifying gendered citation imbalance in computer science conferences
Quantifying gendered citation imbalance in computer science conferences Open
The number of citations received by papers often exhibits imbalances in terms of author attributes such as country of affiliation and gender. While recent studies have quantified citation imbalance in terms of the authors' gender in journa…
View article: Usefulness of Clinical Frailty Scale for Comprehensive Geriatric Assessment of Older Heart Failure Patients
Usefulness of Clinical Frailty Scale for Comprehensive Geriatric Assessment of Older Heart Failure Patients Open
Background: Comprehensive geriatric assessment (CGA) is a multidisciplinary diagnostic process to identify the physical, psychological, and social functions of patients with frailty. The Clinical Frailty Scale (CFS) might aid…
View article: Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet Open
Emergent quasiparticles with a Dirac dispersion in condensed matter systems can be described by the Dirac equation for relativistic electrons, in analogy with Dirac particles in high-energy physics. For example, electrons with a Dirac disp…
View article: Bond-dependent anisotropy and magnon decay in cobalt-based Kitaev triangular antiferromagnet
Bond-dependent anisotropy and magnon decay in cobalt-based Kitaev triangular antiferromagnet Open
View article: Novel germanium-based magnetic semiconductors
Novel germanium-based magnetic semiconductors Open
The prospect of integrating electron charge and spin degrees of freedom has invigorated the field of spinpolarized electronics,‘‘spintronics’’ [1,2]. Most activities are focused on Mn-doped compounds of group III-V and II-VI families, wher…
View article: Bond-dependent anisotropy and magnon decay in cobalt-based Kitaev triangular antiferromagnet
Bond-dependent anisotropy and magnon decay in cobalt-based Kitaev triangular antiferromagnet Open
The Kitaev model, a honeycomb network of spins with bond-dependent anisotropic interactions, is a rare example of having a quantum spin liquid ground state. Although most Kitaev model candidate materials eventually order magnetically due t…
View article: Weyl–Kondo semimetal behavior in the chiral structure phase of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ce</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Rh</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:mrow></mml:math>
Weyl–Kondo semimetal behavior in the chiral structure phase of Open
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View article: Experimental evidence for the significance of optical phonons in thermal transport of tin monosulfide
Experimental evidence for the significance of optical phonons in thermal transport of tin monosulfide Open
The understanding of the lattice dynamics is essential for engineering the thermal transport properties in quantum materials. Based on the canonical point of view, acoustic phonons are believed to be the principal thermal carriers in heat …
View article: Magnetic field effects in an octupolar quantum spin liquid candidate
Magnetic field effects in an octupolar quantum spin liquid candidate Open
Quantum spin liquid (QSL) is a disordered state of quantum-mechanically entangled spins commonly arising from frustrated magnetic dipolar interactions. However, QSL in some pyrochlore magnets can also come from frustrated magnetic octupola…
View article: Magnetic field effects in an octupolar quantum spin liquid candidate
Magnetic field effects in an octupolar quantum spin liquid candidate Open
Quantum spin liquid (QSL) is a disordered state of quantum-mechanically entangled spins commonly arising from frustrated magnetic dipolar interactions. However, QSL in some pyrochlore magnets can also come from frustrated magnetic octupola…
View article: Q-dependent collective relaxation dynamics of glass-forming liquid Ca0.4K0.6(NO3)1.4 investigated by wide-angle neutron spin-echo
Q-dependent collective relaxation dynamics of glass-forming liquid Ca0.4K0.6(NO3)1.4 investigated by wide-angle neutron spin-echo Open
View article: Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet
Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet Open
Spin dynamics of the spin-1/2 kagome lattice antiferromagnet Cs$_2$Cu$_3$SnF$_{12}$ was studied using high-resolution, time-of-flight inelastic neutron scattering. The flat mode, a characteristic of the frustrated kagome antiferromagnet, a…
View article: Possible options for efficient wide-band polychromatic measurements using chopper spectrometers at pulsed sources
Possible options for efficient wide-band polychromatic measurements using chopper spectrometers at pulsed sources Open
The polychromatic incident energy measurements using chopper spectrometers at pulsed sources enables us to measure dynamics with different energy resolutions, i.e., different time-windows with a single-measurement. By increasing the possib…
View article: Magnons and Spinons in $\mathrm{Ba}_2\mathrm{CoTeO}_6 $: A Composite System of Isolated Spin-$1/2$ Triangular Heisenberg-like and Frustrated Honeycomb Ising-like Antiferromagnets
Magnons and Spinons in $\mathrm{Ba}_2\mathrm{CoTeO}_6 $: A Composite System of Isolated Spin-$1/2$ Triangular Heisenberg-like and Frustrated Honeycomb Ising-like Antiferromagnets Open
We report the neutron scattering results on magnetic orderings and excitations in $\mathrm{Ba}_2\mathrm{CoTeO}_6$ composed of two almost isolated subsystems A and B, which are described as an $S\,{=}\,1/2$ triangular Heisenberg-like antife…
View article: Pulmonary Tumor Thrombotic Microangiopathy Caused by Recurrent Gastric Cancer 26 Years After Total Gastrectomy
Pulmonary Tumor Thrombotic Microangiopathy Caused by Recurrent Gastric Cancer 26 Years After Total Gastrectomy Open
Pulmonary tumor thrombotic microangiopathy (PTTM) is a rare cancer-related complication that induces pulmonary hypertension (PH). PTTM can be caused by recurrent cancer, with 12 years being the longest reported interval from primary cancer…
View article: Integrated backscatter-intravascular ultrasound and modification of plaque during excimer laser coronary angioplasty
Integrated backscatter-intravascular ultrasound and modification of plaque during excimer laser coronary angioplasty Open
This study aims to test the hypothesis that the effect of excimer laser coronary angioplasty (ELCA) not only vaporizes thrombi and their underlying coronary plaque, it also changes their quality. We performed a series of cross-sectional an…
View article: Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid Open
Glassy magnetic behavior has been observed in a wide range of crystalline magnetic materials called spin glass. Here, we report spin glass behavior in a structural glass of a magnetic ionic liquid, C4mimFeCl 4 . Magnetization measurements …
View article: Sequence-dependent Hydration Water Dynamics of Dodecameric DNA
Sequence-dependent Hydration Water Dynamics of Dodecameric DNA Open
View article: Mode Distribution Analysis for Superionic Melt of CuI by Coherent Quasielastic Neutron Scattering
Mode Distribution Analysis for Superionic Melt of CuI by Coherent Quasielastic Neutron Scattering Open
View article: Recent Update of AMATERAS: A Cold-Neutron Disk-Chopper Spectrometer
Recent Update of AMATERAS: A Cold-Neutron Disk-Chopper Spectrometer Open
View article: Dimensional reduction by geometrical frustration in a cubic antiferromagnet composed of tetrahedral clusters
Dimensional reduction by geometrical frustration in a cubic antiferromagnet composed of tetrahedral clusters Open
Dimensionality is a critical factor in determining the properties of solids and is an apparent built-in character of the crystal structure. However, it can be an emergent and tunable property in geometrically frustrated spin systems. Here,…
View article: Relevance of hydrogen bonded associates to the transport properties and nanoscale dynamics of liquid and supercooled 2-propanol
Relevance of hydrogen bonded associates to the transport properties and nanoscale dynamics of liquid and supercooled 2-propanol Open
Collective dynamics is Arrhenius over length-scales matching distances between H-bonded associates, and super-Arrhenius on approaching the supercooled state over inter-molecular distances.
View article: Neutron Spin–Echo Studies of the Structural Relaxation of Network Liquid ZnCl<sub>2</sub> at the Structure Factor Primary Peak and Prepeak
Neutron Spin–Echo Studies of the Structural Relaxation of Network Liquid ZnCl<sub>2</sub> at the Structure Factor Primary Peak and Prepeak Open
Using neutron spin-echo spectroscopy, we studied the microscopic structural relaxation of a prototypical network ionic liquid ZnCl2 at the structure factor primary peak and prepeak. The results show that the relaxation at the pr…
View article: Bound spinon excitations in the spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> anisotropic triangular antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ca</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>Re</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Bound spinon excitations in the spin- anisotropic triangular antiferromagnet Open
The spin excitations of the S=1/2 anisotropic triangular antiferromagnet Ca_{3}ReO_{5}Cl_{2} were investigated by inelastic neutron-scattering experiments. The spin excitation spectrum exhibits sharp dispersive modes in addition to a spino…