Takuya Aoyama
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View article: Circular Dichroism in Resonant Inelastic X-Ray Scattering: Probing Altermagnetic Domains in MnTe
Circular Dichroism in Resonant Inelastic X-Ray Scattering: Probing Altermagnetic Domains in MnTe Open
X-ray magnetic circular dichroism provides a means to identify ferromagnetic, chiral, and altermagnetic orders via their time-reversal-symmetry ( T ) breaking. However, the symmetry properties that govern circular dichroism (CD) in res…
View article: Piezomagnetic effect in 5$d$ transition metal oxides Y$_2$Ir$_2$O$_7$ and Cd$_2$Os$_2$O$_7$ with all-in/all-out magnetic order
Piezomagnetic effect in 5$d$ transition metal oxides Y$_2$Ir$_2$O$_7$ and Cd$_2$Os$_2$O$_7$ with all-in/all-out magnetic order Open
We investigated the piezomagnetic effect in pyrochlore-type oxides Y$_2$Ir$_2$O$_7$ and Cd$_2$Os$_2$O$_7$, which show a non-coplanar magnetic structure called the all-in/all-out antiferromagnetic order at low temperatures. The all-in/all-o…
View article: Circular Dichroism in Resonant Inelastic X-ray Scattering: Probing Altermagnetic Domains in MnTe
Circular Dichroism in Resonant Inelastic X-ray Scattering: Probing Altermagnetic Domains in MnTe Open
X-ray magnetic circular dichroism provides a means to identify ferromagnetic, chiral, and altermagnetic orders via their time-reversal-symmetry ($\mathcal{T}$) breaking. However, differentiating magnetic domains related by crystallographic…
View article: Piezomagnetic Effect in Antiferromagnets with Broken Time-Reversal Symmetry
Piezomagnetic Effect in Antiferromagnets with Broken Time-Reversal Symmetry Open
View article: Observation of Thermally Induced Piezomagnetic Switching in Cu<sub>2</sub>OSeO<sub>3</sub> Polymorph Synthesized under High‐Pressure (Adv. Phys. Res. 11/2024)
Observation of Thermally Induced Piezomagnetic Switching in Cu<sub>2</sub>OSeO<sub>3</sub> Polymorph Synthesized under High‐Pressure (Adv. Phys. Res. 11/2024) Open
View article: Observation of Thermally Induced Piezomagnetic Switching in Cu<sub>2</sub>OSeO<sub>3</sub> Polymorph Synthesized under High‐Pressure
Observation of Thermally Induced Piezomagnetic Switching in Cu<sub>2</sub>OSeO<sub>3</sub> Polymorph Synthesized under High‐Pressure Open
A polymorph of Cu 2 OSeO 3 with the distorted kagome lattice is successfully obtained using the high‐pressure synthesis technique (Cu 2 OSeO 3 ‐HP). The structural analysis using X‐ray and neutron powder diffraction suggests that the tetra…
View article: CCDC 2291136: Experimental Crystal Structure Determination
CCDC 2291136: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2291135: Experimental Crystal Structure Determination
CCDC 2291135: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Thermal Magnetoelectrics in all Inorganic Quasi-Two-Dimensional Halide Perovskites
Thermal Magnetoelectrics in all Inorganic Quasi-Two-Dimensional Halide Perovskites Open
From lithium-ion batteries to high-temperature superconductors, oxide materials have been widely used in electronic devices. However, demands of future technologies require materials beyond oxides, as anion chemistries distinct from oxygen…
View article: Observation of Giant Band Splitting in Altermagnetic MnTe
Observation of Giant Band Splitting in Altermagnetic MnTe Open
We performed angle-resolved photoemission spectroscopy (ARPES) on hexagonal MnTe, a candidate for an altermagnet with a high critical temperature (TN=307 K). By utilizing photon-energy-tunable ARPES in combination with first-principles cal…
View article: Piezomagnetic Properties in Altermagnetic MnTe
Piezomagnetic Properties in Altermagnetic MnTe Open
We examined the piezomagnetic effect in an antiferromagnet composed of MnTe, which is a candidate material for altermagnetism with a high critical temperature. We observed that the magnetization develops with the application of stress and …
View article: Light-induced magnetization driven by interorbital charge motion in the spin-orbit assisted Mott insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>RuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Light-induced magnetization driven by interorbital charge motion in the spin-orbit assisted Mott insulator Open
In a honeycomb-lattice spin-orbit assisted Mott insulator α-RuCl_{3}, ultrafast magnetization is induced by circularly polarized excitation below the Mott gap. Photocarriers play an important role, which are generated by turning down the s…
View article: Pressure-Induced Superconductivity in Iron-Based Spin-Ladder Compound BaFe2+δ(S1−xSex)3
Pressure-Induced Superconductivity in Iron-Based Spin-Ladder Compound BaFe2+δ(S1−xSex)3 Open
The iron-based superconductors had a significant impact on condensed matter physics. They have a common structural motif of a two-dimensional square iron lattice and exhibit fruitful physical properties as a strongly correlated electron sy…
View article: Strongly Electron-Correlated Semimetal RuI<sub>3</sub> with a Layered Honeycomb Structure
Strongly Electron-Correlated Semimetal RuI<sub>3</sub> with a Layered Honeycomb Structure Open
A polymorph of RuI$_3$ synthesized under high pressure was found to have a\ntwo-layered honeycomb structure. The resistivity of RuI$_3$ exhibits a\nsemimetallic behavior, in contrast to insulating properties in\n$\\alpha$-RuCl$_3$. In addi…
View article: Strongly electron-correlated semimetal RuI$_3$ with a layered honeycomb structure
Strongly electron-correlated semimetal RuI$_3$ with a layered honeycomb structure Open
A polymorph of RuI$_3$ synthesized under high pressure was found to have a two-layered honeycomb structure. The resistivity of RuI$_3$ exhibits a semimetallic behavior, in contrast to insulating properties in $α$-RuCl$_3$. In addition, Pau…
View article: Magnetism of Kitaev spin-liquid candidate material RuBr$_3$
Magnetism of Kitaev spin-liquid candidate material RuBr$_3$ Open
The ruthenium halide $α$-RuCl$_{3}$ is a promising candidate for a Kitaev spin liquid. However, the microscopic model describing $α$-RuCl$_{3}$ is still debated partly because of a lack of analogue materials for $α$-RuCl$_{3}$, which preve…
View article: Spin orientation switching in layered perovskite oxyfluoride Pb3Fe2O5F2
Spin orientation switching in layered perovskite oxyfluoride Pb3Fe2O5F2 Open
Control of spin alignment in magnetic materials is crucial for developing switching devices. In molecular magnets, magnetic anisotropy can be rationally controlled by varying their ligands that allow tuning of ligand field splitting energy…
View article: Dichotomy between orbital and magnetic nematic instabilities in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Dichotomy between orbital and magnetic nematic instabilities in Open
Nematic orders emerge nearly universally in iron-based superconductors, but elucidating their origins is challenging because of intimate couplings between orbital and magnetic fluctuations. The iron-based ladder material BaFe_{2}S_{3}, whi…
View article: Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3
Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3 Open
Nematic orders emerge nearly universally in iron-based superconductors, but elucidating their origins is challenging because of intimate couplings between orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3, which sup…
View article: Hydrated lithium intercalation into the Kitaev spin liquid candidate material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>RuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Hydrated lithium intercalation into the Kitaev spin liquid candidate material Open
We study on transport and magnetic properties of hydrated and\nlithium-intercalated $\\alpha$-RuCl$_3$, Li$_x$RuCl$_3 \\cdot y$H$_2$O, for\ninvestigating the effect on mobile-carrier doping into candidate materials for\na realization of a …
View article: Polar state induced by block-type lattice distortions in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> with quasi-one-dimensional ladder structure
Polar state induced by block-type lattice distortions in with quasi-one-dimensional ladder structure Open
Temperature dependent crystal structures of the quasi-one-dimensional ladder material BaFe2Se3 are examined. Combining the optical second harmonic generation (SHG) experiments and neutron diffraction measurements, we elucidate the crystal …
View article: Multiferroic Properties in Orthorhombic <i>R</i>MnO<sub>3</sub> (<i>R</i>=Dy, Tb, and Gd) under High Pressures
Multiferroic Properties in Orthorhombic <i>R</i>MnO<sub>3</sub> (<i>R</i>=Dy, Tb, and Gd) under High Pressures Open
The hydrostatic pressure effect on multiferroic properties of rare-earth manganites RMnO3 (R=Dy, Tb, and Gd) with the Pbnm orthorhombic structure was investigated by using a diamond anvil cell. Under high pressures, all of these manganites…
View article: Quantum Paramagnet Near Spin‐State Transition (Adv. Quantum Technol. 3/2018)
Quantum Paramagnet Near Spin‐State Transition (Adv. Quantum Technol. 3/2018) Open
In article number 1800057, Keisuke Tomiyasu and co-workers report that Sc substitution in LaCoO3 destabilizes its nonmagnetic low-spin state and generates an anomalous paramagnetic state accompanied by the enhancement of transport gap and …
View article: Quantum Paramagnet Near Spin‐State Transition
Quantum Paramagnet Near Spin‐State Transition Open
Spin‐state transition, also known as spin crossover, plays a key role in diverse systems, including minerals and biological materials. In theory, the boundary range between the low‐ and high‐spin states is expected to enrich the transition…
View article: CCDC 1840119: Experimental Crystal Structure Determination
CCDC 1840119: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1848132: Experimental Crystal Structure Determination
CCDC 1848132: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1840120: Experimental Crystal Structure Determination
CCDC 1840120: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1840117: Experimental Crystal Structure Determination
CCDC 1840117: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1840118: Experimental Crystal Structure Determination
CCDC 1840118: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1840111: Experimental Crystal Structure Determination
CCDC 1840111: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …