Masaki Gen
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View article: Magnetocaloric effect measurements in ultrahigh magnetic fields up to 120 T
Magnetocaloric effect measurements in ultrahigh magnetic fields up to 120 T Open
We report proof-of-concept measurements of the magnetocaloric effect (MCE) in ultrahigh magnetic fields up to 120 T for the classical spin-ice compound Ho$_{2}$Ti$_{2}$O$_{7}$. Radio-frequency resistivity measurements using an Au$_{16}$Ge$…
View article: Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides
Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides Open
The spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice (ATL) is an archetypal spin system hosting exotic quantum magnetism and dimensional crossover. However, the progress in experimental research on this field has be…
View article: X-Ray Free-Electron Laser Observation of Giant and Anisotropic Magnetostriction in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>β</mml:mi> <mml:mtext>−</mml:mtext> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> at 110 Tesla
X-Ray Free-Electron Laser Observation of Giant and Anisotropic Magnetostriction in at 110 Tesla Open
In strong magnetic fields beyond 100 T, the significant Zeeman energy competes with the lattice interactions, where a considerable magnetostriction is expected. However, the microscopic observation of the magnetostriction above 100 T has b…
View article: Dataset accociated with manuscript Quintuplet condensation in the skyrmionic insulator Cu2OSeO3 at ultrahigh magnetic fields
Dataset accociated with manuscript Quintuplet condensation in the skyrmionic insulator Cu2OSeO3 at ultrahigh magnetic fields Open
Dataset of Fig. 2 (b): Magnetic field (T), Faraday rotation angle (deg/0.62mm), Transmission amplitude
View article: Unified description of spin-lattice coupling: application to thermodynamic properties of the pyrochlore Heisenberg antiferromagnet
Unified description of spin-lattice coupling: application to thermodynamic properties of the pyrochlore Heisenberg antiferromagnet Open
We present an extended model to describe the spin-lattice coupling, incorporating individual vibrations of bonds and atomic sites alongside distance-dependent exchange interactions. The proposed spin Hamiltonian can be effectively consider…
View article: Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution
Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution Open
Nodal‐line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal‐line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent t…
View article: X-ray free-electron laser observation of giant and anisotropic magnetostriction in $β$-O$_{2}$ at 110 Tesla
X-ray free-electron laser observation of giant and anisotropic magnetostriction in $β$-O$_{2}$ at 110 Tesla Open
In strong magnetic fields beyond 100 T, the significant Zeeman energy competes with the lattice interactions, where a considerable magnetostriction is expected. However, the microscopic observation of the magnetostriction above 100 T has b…
View article: Perfectly harmonic spin cycloid and multi-$Q$ textures in the Weyl semimetal GdAlSi
Perfectly harmonic spin cycloid and multi-$Q$ textures in the Weyl semimetal GdAlSi Open
A fundamental question concerns how topological electronic states are influenced by many-body correlations, and magnetic Weyl semimetals represent an important material platform to address this problem. However, the magnetic structures rea…
View article: Canted antiferromagnetism in a spin-orbit coupled Seff = 3/2 triangular-lattice magnet DyAuGe
Canted antiferromagnetism in a spin-orbit coupled Seff = 3/2 triangular-lattice magnet DyAuGe Open
View article: Triangular Lattice Magnet GdGa<sub>2</sub> with Short-Period Spin Cycloids and Possible Skyrmion Phases
Triangular Lattice Magnet GdGa<sub>2</sub> with Short-Period Spin Cycloids and Possible Skyrmion Phases Open
The two-dimensional triangular lattice (TAL) is a model system of magnetic frustration and competing interactions, where skyrmion spin vortices can be induced by a vertical magnetic field $B$. We target the binary compound GdGa$_2$ with an…
View article: Electronic Structure of Kramers Nodal-Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare-Earth Substitution
Electronic Structure of Kramers Nodal-Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare-Earth Substitution Open
Nodal-line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal-line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent t…
View article: Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction
Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction Open
We report on a comprehensive thermodynamic study of a quasi-two-dimensional (quasi-2D) quantum magnet Cu$_2$(OH)$_3$Br which in the 2D layer can be viewed as strongly coupled alternating antiferromagnetic and ferromagnetic chains. In an ap…
View article: Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields
Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields Open
We present a comprehensive study of the magnetoelastic properties of the Ising pyrochlore oxide Ho$_{2}$Ti$_{2}$O$_{7}$, known as spin ice, by means of high-field magnetostriction measurements and numerical calculations. When a magnetic fi…
View article: Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets Open
Honeycomb-lattice antiferromagnets have attracted wide attention for\nexploration of exotic heat transport and their interplay with magnetic\nexcitations. In this work, we have revealed a contrasting behavior in the\nmagneto-thermal conduc…
View article: Negative charge-transfer energy in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>SrFeO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math> revisited with hard x-ray photoemission spectroscopy
Negative charge-transfer energy in revisited with hard x-ray photoemission spectroscopy Open
We report hard x-ray photoelectron spectroscopy on SrFeO3 which is one of the classical conducting transition-metal oxides with a noncollinear magnetic structure. The obtained spectra show a detailed charge-transfer (CT) satellite structur…
View article: Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCr$_{4}$S$_{8}$ and CuGaCr$_{4}$S$_{8}$
Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCr$_{4}$S$_{8}$ and CuGaCr$_{4}$S$_{8}$ Open
We report low-temperature powder X-ray and neutron diffraction studies on breathing pyrochlore magnets Cu$M$Cr$_{4}$S$_{8}$ ($M$ = Al, Ga), which undergo a magnetic transition at $T_{\rm N} \approx$ 21 and 31 K for {$M$ = Al and Ga, respec…
View article: Metamagnetism and anomalous magnetotransport properties in rare-earth-based polar semimetals $R$AuGe ($R =$ Dy, Ho, and Gd)
Metamagnetism and anomalous magnetotransport properties in rare-earth-based polar semimetals $R$AuGe ($R =$ Dy, Ho, and Gd) Open
We report the magnetic, magnetoelastic, and magnetotransport properties of single crystals of polar magnets $R$AuGe ($R=$ Dy, Ho, and Gd), grown by Au-Ge self-flux. Magnetization and magnetostriction measurements reveal multi-step metamagn…
View article: Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$
Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$ Open
Zintl phase EuIn$_{2}$As$_{2}$ has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double-${\mathbf Q}$ broken-helix state in previous studies, however, its periodicity and symm…
View article: Canted antiferromagnetism in a spin-orbit coupled $S_{\text{eff}} = 3/2$ triangular-lattice magnet DyAuGe
Canted antiferromagnetism in a spin-orbit coupled $S_{\text{eff}} = 3/2$ triangular-lattice magnet DyAuGe Open
Exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Extensive studies are concentrated on rare-earth-based magnets and 4d/5d transition metal compounds, which are m…
View article: Cluster rearrangement by chiral charge order in lacunar spinel GaNb$_4$Se$_8$
Cluster rearrangement by chiral charge order in lacunar spinel GaNb$_4$Se$_8$ Open
Transition-metal atoms with d electrons sometimes form clusters in crystals, which significantly affects the physical properties. Such a cluster formation frequently accompanies a change in the crystal system, leading to the presence of do…
View article: Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets
Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets Open
The spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice (ATL) is an archetypal spin system hosting exotic quantum magnetism and dimensional crossover. However, the progress in experimental research on this field has be…
View article: CSD 2245476: Experimental Crystal Structure Determination
CSD 2245476: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Real‐Space Observation of Ligand Hole State in Cubic Perovskite SrFeO<sub>3</sub>
Real‐Space Observation of Ligand Hole State in Cubic Perovskite SrFeO<sub>3</sub> Open
An anomalously high valence state sometimes shows up in transition‐metal oxide compounds. In such systems, holes tend to occupy mainly the ligand p orbitals, giving rise to interesting physical properties such as superconductivity in cupra…
View article: Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet
Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet Open
The mutual coupling of spin and lattice degrees of freedom is ubiquitous in magnetic materials and potentially creates exotic magnetic states in response to the external magnetic field. Particularly, geometrically frustrated magnets serve …
View article: Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets
Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets Open
View article: Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO$_3$
Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO$_3$ Open
An anomalously high valence state sometimes shows up in transition-metal oxide compounds. In such systems, holes tend to occupy mainly the ligand $p$ orbitals, giving rise to interesting physical properties such as superconductivity in cup…
View article: Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd–Tm, and Lu)
Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd–Tm, and Lu) Open
We study structural and magnetic properties of rare-earth based semimetals RAuGe (R = Y, Gd-Tm, and Lu) using flux-grown single crystals. These compounds belong to the noncentrosymmetric polar space group P63mc. We confirm the systematic s…
View article: Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd-Tm, and Lu)
Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd-Tm, and Lu) Open
We study structural and magnetic properties of rare-earth based semimetals RAuGe (R = Y, Gd-Tm, and Lu) using flux-grown single crystals. These compounds belong to the noncentrosymmetric polar space group P63mc. We confirm the systematic s…
View article: Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet
Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet Open
Dataset related to our paper "Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet" accepted in PNAS journal are presented.
View article: Magnetic-Field-Induced Antiferromagnetic–Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub>
Magnetic-Field-Induced Antiferromagnetic–Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub> Open
We investigate the magnetoelectric property of a quasi-two-dimensional magnet Ba2FeSi2O7. An in-plane magnetic field induces a phase transition that is accompanied by only a small magnetization anomaly but apparent electric polarization ch…