Yoshiya Uwatoko
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View article: Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb) <sub>0.10</sub> (MoRuRe)<sub>0.90</sub>
Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb) <sub>0.10</sub> (MoRuRe)<sub>0.90</sub> Open
We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb) 0.10 (MoRuRe) 0.90 . Temperature-dependent resistivity ( ρ ( T )) and magnetization measurements w…
View article: Pressure effects on superconducting phases of Eu<sub>2</sub>SrBi<sub>2</sub>S<sub>2</sub>Se<sub>2</sub>F<sub>4</sub>
Pressure effects on superconducting phases of Eu<sub>2</sub>SrBi<sub>2</sub>S<sub>2</sub>Se<sub>2</sub>F<sub>4</sub> Open
We have measured electrical resistivity and X-ray diffraction under high-pressure on the BiS 2 -based superconductor Eu 2 SrBi 2 S 2 Se 2 F 4 , using cubic anvil cell and diamond anvil cell, respectively. The superconducting transition tem…
View article: Pressure-Driven Semiconductor-to-Metal, Magnetic, and Structural Transitions in the Ferrimagnetic Semiconductor Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub>
Pressure-Driven Semiconductor-to-Metal, Magnetic, and Structural Transitions in the Ferrimagnetic Semiconductor Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub> Open
Mn 3 Si 2 Te 6 is a ferrimagnetic nodal-line semiconductor with colossal angular magnetoresistance at ambient pressure. In this work, we investigated the effect of hydrostatic pressure on its electrical transport properties, magnetic trans…
View article: A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure
A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure Open
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View article: Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures
Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures Open
The simultaneous application of high magnetic fields and high pressures for controlling magnetic ground states is important for testing our understanding of many-body quantum theory. However, the implementation for neutron scattering exper…
View article: Pressure Variation of Magnetism in Chromium and Manganese Mono-Pnictide Superconductors
Pressure Variation of Magnetism in Chromium and Manganese Mono-Pnictide Superconductors Open
The transition-metal pnictide system MX (M = transition metal and X = P, As, and Sb) has been studied for several decades because those materials show rich magnetic phase diagrams. Since the recent discovery of unconventional superconducti…
View article: Type I and type II superconductivity in a quasi-2D Dirac metal
Type I and type II superconductivity in a quasi-2D Dirac metal Open
Dirac material LaCuSb 2 shows anisotropic superconducting response to applied magnetic fields.
View article: Combined x-ray diffraction, electrical resistivity, and <i>ab initio</i> study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>(TMTTF)</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>PF</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math> under pressure: Implications for the unified phase diagram
Combined x-ray diffraction, electrical resistivity, and <i>ab initio</i> study of under pressure: Implications for the unified phase diagram Open
We present a combined experimental and theoretical study on the quasi-one-dimensional organic conductor (TMTTF)2PF6, and elucidate the variation of its physical properties under pressure. We fully resolve the crystal structure by single cr…
View article: Simultaneous achievement of record-breaking colossal magnetoresistance and angular magnetoresistance in an antiferromagnetic semiconductor EuSe2
Simultaneous achievement of record-breaking colossal magnetoresistance and angular magnetoresistance in an antiferromagnetic semiconductor EuSe2 Open
Magnetoresistance effect lays the foundation for spintronics, magnetic sensors and hard drives. The pursuit of magnetic materials with colossal magnetoresistance (CMR) and/or angular magnetoresistance (AMR) has attracted enduring research …
View article: Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures
Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures Open
The simultaneous application of high magnetic fields and high pressures for controlling magnetic ground states is important for testing our understanding of many-body quantum theory. However, the implementation for neutron scattering exper…
View article: Effect of antisite disorder on the magnetic and transport properties of a quaternary Heusler alloy
Effect of antisite disorder on the magnetic and transport properties of a quaternary Heusler alloy Open
Spin gapless semiconductors based Heusler alloys are the special class of materials due to their unique band structure, high spin polarization and high Curie temperature. These materials exhibit a distinct electronic structure: a nonzero b…
View article: Pressure effects on superconductivity in EuSr<sub>2</sub>Bi<sub>2</sub>S<sub>2.5</sub>Se<sub>1.5</sub>F<sub>4</sub> at 1 K
Pressure effects on superconductivity in EuSr<sub>2</sub>Bi<sub>2</sub>S<sub>2.5</sub>Se<sub>1.5</sub>F<sub>4</sub> at 1 K Open
We performed electrical resistivity and X-ray diffraction measurements on the BiS 2 -based compound, EuSr 2 Bi 2 S 2.5 Se 1.5 F 4 , under high pressure using cubic and diamond anvil cells, respectively. We have also measured electrical res…
View article: Bulk high-temperature superconductivity in the high-pressure tetragonal phase of bilayer La2PrNi2O7
Bulk high-temperature superconductivity in the high-pressure tetragonal phase of bilayer La2PrNi2O7 Open
The Ruddlesden-Popper (R-P) bilayer nickelate, La3Ni2O7, was recently found to show signatures of high-temperature superconductivity (HTSC) at pressures above 14 GPa. Subsequent investigations achieved zero resistance in single- and poly-c…
View article: Doping-tunable Fermi surface with persistent topological Hall effect in axion candidate EuIn$_2$As$_2$
Doping-tunable Fermi surface with persistent topological Hall effect in axion candidate EuIn$_2$As$_2$ Open
Rare-earth Zintl compound EuIn$_2$As$_2$ has been theoretically recognized as a candidate for realizing an intrinsic antiferromagnetic (AFM) bulk axion insulator and a higher-order topological state, which provides a fertile platform to ex…
View article: Pressure-induced nearly perfect rectangular lattice and superconductivity in an organic molecular crystal (DMET-TTF)$_2$AuBr$_2$
Pressure-induced nearly perfect rectangular lattice and superconductivity in an organic molecular crystal (DMET-TTF)$_2$AuBr$_2$ Open
External pressure and associated changes in lattice structures are key to realizing exotic quantum phases such as high-$T_{\rm c}$ superconductivity. While applying external pressure is a standard method to induce novel lattice structures,…
View article: Pressure-induced enhancement of superconductivity in a non-centrosymmetric compound LaPtGe
Pressure-induced enhancement of superconductivity in a non-centrosymmetric compound LaPtGe Open
We report a pressure-induced enhancement of the superconducting transition temperature (Tc) in a non-centrosymmetric (NCS) compound, LaPtGe. With pressure, till 3 GPa, we observed a modest enhancement of the Tc with a rate of 0.071 K/GPa. …
View article: Combined X-ray diffraction, electrical resistivity, and $ab$ $initio$ study of (TMTTF)$_2$PF$_6$ under pressure: implications to the unified phase diagram
Combined X-ray diffraction, electrical resistivity, and $ab$ $initio$ study of (TMTTF)$_2$PF$_6$ under pressure: implications to the unified phase diagram Open
We present a combined experimental and theoretical study on the quasi-one-dimensional organic conductor (TMTTF)$_2$PF$_6$, and elucidate the variation of its physical properties under pressure. We fully resolve the crystal structure by sin…
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: Pressure-induced linear enhancement of the superconducting transition in Nd<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> thin films
Pressure-induced linear enhancement of the superconducting transition in Nd<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> thin films Open
We report the pressure ( P ) effect on the superconducting transition temperature T c and the upper critical field μ 0 H c2 of infinite-layer Nd 0.8 Sr 0.2 NiO 2 thin films by measuring the electrical transport properties under various hyd…
View article: Observation of high-temperature superconductivity in the high-pressure tetragonal phase of La2PrNi2O7-δ
Observation of high-temperature superconductivity in the high-pressure tetragonal phase of La2PrNi2O7-δ Open
The recent discovery of high-temperature superconductivity in the Ruddlesden-Popper phase La3Ni2O7 under high pressure marks a significant breakthrough in the field of 3d transition-metal oxide superconductors. For an emerging novel class …
View article: Helical magnetic state in the vicinity of the pressure-induced superconducting phase in MnP
Helical magnetic state in the vicinity of the pressure-induced superconducting phase in MnP Open
MnP is a metal that shows successive magnetic transitions from paramagnetic to ferromagnetic and helical magnetic phases at ambient pressure with decreasing temperature. With applied pressure, the magnetic transition temperatures decrease …
View article: Emergence of high-temperature superconducting phase in the pressurized La3Ni2O7 crystals
Emergence of high-temperature superconducting phase in the pressurized La3Ni2O7 crystals Open
The recent report of pressure-induced structure transition and signature of superconductivity with Tc = 80 K above 14 GPa in the La3Ni2O7 crystals has garnered considerable attention. To further elaborate this discovery, we carried out com…
View article: Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe Open
The study of the iron-based superconductor, FeSe, has resulted in various topics, such as the interplay among superconductivity, nematicity, and magnetism, Bardeen-Cooper-Schrieffer Bose-Einstein-condensation (BCS-BEC) crossover, and Fulde…
View article: NiCrAl piston-cylinder cell for magnetic susceptibility measurements under high pressures in pulsed high magnetic fields
NiCrAl piston-cylinder cell for magnetic susceptibility measurements under high pressures in pulsed high magnetic fields Open
We developed a metallic pressure cell made of nickel-chromium-aluminum (NiCrAl) for use with a non-destructive pulse magnet and a magnetic susceptibility measurement apparatus with a proximity detector oscillator (PDO) in pulsed magnetic f…