Hirotada Gotou
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View article: Magnetic excitations of the Kitaev model candidate RuBr3
Magnetic excitations of the Kitaev model candidate RuBr3 Open
The Kitaev model, which consists of bond-dependent Ising interactions on the honeycomb plane, is known as a promising model for realising a spin liquid in the exact ground state. Since bond-dependent Ising interactions are induced by orbit…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>J</mml:mi></mml:math>=<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> pseudospins and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>d</mml:mi><mml:mtext>−</mml:mtext><mml:mi>p</mml:mi></mml:mrow></mml:math> hybridization in the Kitaev spin liquid candidates <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Ru</mml:mi><mml:msub><mml:mi>X</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>X</mml:mi></mml:math>=Cl, Br, I)
= pseudospins and hybridization in the Kitaev spin liquid candidates (=Cl, Br, I) Open
The recent synthesis of ruthenium trihalides Ru$X_3$ ($X$ = Cl, Br, I) has\nenlarged the set of material candidates for Kitaev spin liquid. The realization\nof Kitaev model necessitates the formation of $J=1/2$ pseudospins in the\noctahedr…
View article: Joint Research with High Pressure Laboratory at the Institute for Solid State Physics, University of Tokyo
Joint Research with High Pressure Laboratory at the Institute for Solid State Physics, University of Tokyo Open
View article: Significant Changes in Thermoelectric Properties of Unfilled Skutterudite Compounds Msb3 (M = Co and Rh) by Self-Insertion Reaction
Significant Changes in Thermoelectric Properties of Unfilled Skutterudite Compounds Msb3 (M = Co and Rh) by Self-Insertion Reaction Open
View article: Significant Changes in Thermoelectric Properties of Unfilled Skutterudite Compounds Msb3 (M = Co and Rh) by Self-Insertion Reaction
Significant Changes in Thermoelectric Properties of Unfilled Skutterudite Compounds Msb3 (M = Co and Rh) by Self-Insertion Reaction Open
View article: In-situ X-ray diffraction and radiography of iron–silicate–water–sulfur system simulating behaviors of light elements during early Earth’s core–mantle segregation
In-situ X-ray diffraction and radiography of iron–silicate–water–sulfur system simulating behaviors of light elements during early Earth’s core–mantle segregation Open
The Earth’s iron-rich core contains light elements. Studying the interaction of multiple light elements with iron and silicates during core–mantle segregation process in early Earth evolution has become important. In-situ X-ray diffraction…
View article: High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites <i>R<sub>x</sub></i>Co<sub>4</sub>Sb<sub>12</sub> (<i>R</i> = In, Tb and Dy)
High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites <i>R<sub>x</sub></i>Co<sub>4</sub>Sb<sub>12</sub> (<i>R</i> = In, Tb and Dy) Open
Partially filled skutterudite compounds RxCo4Sb12 (R = In, Tb and Dy, nominal composition 0.1 ≤ x ≤ 1.5) were synthesized under high pressure using multi-anvil presses. The samples were analyzed by x-ray diffraction and scanning electron m…
View article: Effects of sulfur on the hydrogenation of iron in early Earth’s evolution
Effects of sulfur on the hydrogenation of iron in early Earth’s evolution Open
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: Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution Open
View article: Pressure and Field Dependence of Critical Temperature on Superconductivity of Filled Skutterudite YRu<sub>4</sub>P<sub>12</sub>
Pressure and Field Dependence of Critical Temperature on Superconductivity of Filled Skutterudite YRu<sub>4</sub>P<sub>12</sub> Open
We report the pressure dependence of critical temperature on superconductivity (T c ) of a filled skutterudite YRu 4 P 12 by measuring magnetization and resistivity up to 2.4 GPa and 8.0 GPa, respectively.We found that T c is almost indepe…
View article: Rh Substitution Effect on Filled Skutterudite SmRu<sub>4</sub>P<sub>12</sub>
Rh Substitution Effect on Filled Skutterudite SmRu<sub>4</sub>P<sub>12</sub> Open
The compound SmRu 4 P 12 , crystallizing in the filled skutterudite-type structure, has attracted much interest because it exhibits a metal-insulator (M-I) transition associated with unconventional antiferromagnetic ordering of the 4f elec…
View article: Phase stability and thermoelectric properties of semiconductor-like tetragonal FeAl<sub>2</sub>
Phase stability and thermoelectric properties of semiconductor-like tetragonal FeAl<sub>2</sub> Open
Tetragonal FeAl2 is a high-pressure phase and is predicted to exhibit semiconductor-like behavior. We investigated the pressure and temperature synthesizing conditions of tetragonal FeAl2, supported by in situ …
View article: In-situ X-ray Observation of Synthesizing Process for Rare-earth Transition-metal Pnictides under High Temperature and High Pressure
In-situ X-ray Observation of Synthesizing Process for Rare-earth Transition-metal Pnictides under High Temperature and High Pressure Open
situ X-ray Observation of Synthesizing Process for Rare-earth Transition-metal Pnictides under High Temperature and High Pressure
View article: Hydrogenation of iron in the early stage of Earth’s evolution
Hydrogenation of iron in the early stage of Earth’s evolution Open
View article: <i>In-situ</i> Neutron Diffraction of Iron Hydride in Iron-silicate-water System under High Pressure and High Temperature Condition
<i>In-situ</i> Neutron Diffraction of Iron Hydride in Iron-silicate-water System under High Pressure and High Temperature Condition Open
Hydrogen is the most abundant element in the solar system and is considered to be one of the promising candidates of the light elements in the Earth’s core. However, the amount of hydrogen dissolved in the core and its process are still un…
View article: Slater Insulator in Iridate Perovskites with Strong Spin-Orbit Coupling
Slater Insulator in Iridate Perovskites with Strong Spin-Orbit Coupling Open
The perovskite SrIrO_{3} is an exotic narrow-band metal owing to a confluence of the strengths of the spin-orbit coupling (SOC) and the electron-electron correlations. It has been proposed that topological and magnetic insulating phases ca…
View article: Toward the High-Pressure and Temperature Neutron Diffraction Using Large Volume Press
Toward the High-Pressure and Temperature Neutron Diffraction Using Large Volume Press Open
The technical development for the high-pressure and temperature neutron diffraction with six-axis large volume press, ATSUHIME, which has been installed at BL11 (PLANET) in J-PARC, is introduced. The 6-6-type assembly is one of suitable mo…
View article: Investigation of ferromagnetic filled skutterudite compound EuFe<sub>4</sub>As<sub>12</sub>
Investigation of ferromagnetic filled skutterudite compound EuFe<sub>4</sub>As<sub>12</sub> Open
A variety of thermodynamic and transport measurements were performed on As- based filled skutterudite compound EuFe4As12 prepared under high pressure. EuFe4As12 was reported to exhibit a ferromagnetic-like phase transition with an unexpect…
View article: Pressure-induced oligomerization of alanine at 25 °C
Pressure-induced oligomerization of alanine at 25 °C Open
Pressure-induced oligomerization of alanine was found from high-pressure experiments.
View article: Magnetic Properties of New Filled Skutterudite Compound BaFe4As12
Magnetic Properties of New Filled Skutterudite Compound BaFe4As12 Open
View article: Pressure Dependence of Superconductivity in Filled-Skutterudite YOs4P12
Pressure Dependence of Superconductivity in Filled-Skutterudite YOs4P12 Open
We have studied the magnetization on YOs4P12 under pressure up to ∼ 4 GPa. Pure polycrystalline YOs4P12 was prepared by the high-pressure high-temperature method and was evaluated by the X-ray diffraction measurement. YOs4P12 shows superco…