T. Mizokawa
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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: Intrinsic Electronic Structure and Inhomogeneity of High-Entropy Layered REOBiS<sub>2</sub> Superconductors
Intrinsic Electronic Structure and Inhomogeneity of High-Entropy Layered REOBiS<sub>2</sub> Superconductors Open
Two decades after the discovery of high-entropy alloys (HEAs), the field has witnessed these systems rise as prominent examples of high-performance functional materials, overcoming established knowledge of multicomponent systems. HEA super…
View article: Experimental determination of tetramer molecular orbital states in lacunar spinel <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GaNb</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math> via hard x-ray photoemission spectroscopy
Experimental determination of tetramer molecular orbital states in lacunar spinel via hard x-ray photoemission spectroscopy Open
In AM4X8 lacunar spinel systems, the formation of structural clusters in Td symmetry has led to the systems and its properties being commonly described by a M4 molecular orbital picture and its associated spin, charge, and orbital degrees …
View article: Charge/orbital disordered states with smaller volume and higher entropy in transition-metal oxides
Charge/orbital disordered states with smaller volume and higher entropy in transition-metal oxides Open
Some transition-metal oxides such as Ca2RuO4, BiNiO3, and V2OPO4 harbor smaller volume and higher entropy states by role sharing of the spin, charge, and orbital degrees of freedom. Effect of lattice distortions on the various charge/orbit…
View article: Valency, charge-transfer, and orbital-dependent correlation in bilayer nickelates Nd3Ni2O7
Valency, charge-transfer, and orbital-dependent correlation in bilayer nickelates Nd3Ni2O7 Open
We examine the bulk electronic structure of Nd3Ni2O7 using Ni 2p core-level hard x-ray photoemission spectroscopy combined with density functional theory + dynamical mean-field theory. Our results reveal a large deviation of the Ni 3d occu…
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: Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering
Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering Open
Resonant inelastic x-ray scattering (RIXS) can probe electron-hole excitations in excitonic insulators (EIs) which are realized by Coulomb attractive interaction between electrons and holes in semimetals or narrow gap semiconductors. In th…
View article: Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor revealed by micro-focused angle-resolved photoemission spectroscopy
Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor revealed by micro-focused angle-resolved photoemission spectroscopy Open
The development of the protect-annealing method has extended the superconductivity of the electron-doped cuprate Pr$_{1.3-x}$La$_{0.7}$Ce$_{x}$CuO$_{4}$ (PLCCO) into lower Ce concentrations, while the superconducting volume fraction decrea…
View article: Effect of aliovalent substitution on the local structure of CaKFe<sub>4</sub>As<sub>4</sub> superconductor
Effect of aliovalent substitution on the local structure of CaKFe<sub>4</sub>As<sub>4</sub> superconductor Open
We have investigated the local structure of the iron-based CaKFe 4 As 4 superconductor featuring distinct aliovalent substitutions at the Ca and K sites, that is CaKFe 4 As 4 , CaK 0.9 Sr 0.1 Fe 4 As 4 , CaK 0.9 Ba 0.1 Fe 4 As 4 and Ca 0.9…
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: Anisotropic atomic displacements, local orthorhombicity and anomalous local magnetic moment in Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub> superconductor
Anisotropic atomic displacements, local orthorhombicity and anomalous local magnetic moment in Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub> superconductor Open
Local orthorhombic fluctuations and nematic phase in optimally doped iron-based based superconductor with key role of magnetic correlations.
View article: Mechanism of intermetallic charge transfer and bond disproportionation in BiNiO$_3$ and PbNiO$_3$ revealed by hard x-ray photoemission spectroscopy
Mechanism of intermetallic charge transfer and bond disproportionation in BiNiO$_3$ and PbNiO$_3$ revealed by hard x-ray photoemission spectroscopy Open
Perovskites with Bi or Pb on the A-site host a number of interesting and yet to be understood phenomena such as negative thermal expansion in BiNiO$_3$. We employ hard x-ray photoemission spectroscopy of Ni 2$p$ core-level as well as valen…
View article: Oxygen on-site Coulomb energy in Pr$_{1.3-x}$La$_{0.7}$Ce$_x$CuO$_{4}$ and Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ and its relation with Heisenberg exchange
Oxygen on-site Coulomb energy in Pr$_{1.3-x}$La$_{0.7}$Ce$_x$CuO$_{4}$ and Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ and its relation with Heisenberg exchange Open
We study the electronic structure of electron-doped Pr$_{1.3-x}$La$_{0.7}$Ce$_{x}$CuO$_{4}$ (PLCCO ; $T_{c}$ = 27 K, x = 0.1) and hole-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ (Bi2212 ; $T_{c}$ = 90 K) cuprate superconductors using x-ray absorp…
View article: Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1)
Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1) Open
The photoinduced semimetal phase of Ta2Ni1−xCoxSe5 (x = 0.0 and 0.1) is studied by time-resolved angle-resolved photoemission spectroscopy. The observed band dispersions roughly agree with the generalized gradient approximation (GGA) calcu…
View article: Temperature dependent local inhomogeneity and magnetic moments of (Li<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>)OHFeSe superconductors
Temperature dependent local inhomogeneity and magnetic moments of (Li<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>)OHFeSe superconductors Open
Anomalous local structure and magnetic moment of an inhomogeneous FeSe based superconductor indicating importance of the structure and magnetic correlations in these materials.
View article: Orbital dependent band degeneracy and edge states in single layer and AA bilayer honeycomb lattice systems with p orbital degeneracy
Orbital dependent band degeneracy and edge states in single layer and AA bilayer honeycomb lattice systems with p orbital degeneracy Open
We have investigated band structure and edge states of single and AA bilayer honeycomb lattice systems with p orbital degeneracy which would be relevant for relatively heavy metals such as Pb and Bi. The p electrons, which are triply degen…
View article: Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide
Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide Open
Solids undergoing symmetry breaking phase transitions commonly exhibit domains of low symmetry phases with various sizes and morphological shapes. Usually, the shapes of these domains are not directly related to the nature of symmetry brea…
View article: The Local Structure and Metal-Insulator Transition in a Ba3Nb5−xTixO15 System
The Local Structure and Metal-Insulator Transition in a Ba3Nb5−xTixO15 System Open
The local structure of the filled tetragonal tungsten bronze (TTB) niobate Ba3Nb5−xTixO15 (x = 0, 0.1, 0.7, 1.0), showing a metal-insulator transition with Ti substitution, has been studied by Nb K-edge extended X-ray absorption fine struc…
View article: Signature of Kondo hybridisation with an orbital-selective Mott phase in 4d Ca2−xSrxRuO4
Signature of Kondo hybridisation with an orbital-selective Mott phase in 4d Ca2−xSrxRuO4 Open
The heavy fermion state with Kondo-hybridisation (KH), usually manifested in f -electron systems with lanthanide or actinide elements, was recently discovered in several 3 d transition metal compounds without f -electrons. However, KH has …
View article: Domain Resolved nano-ARPES Study on Orbital Ordered Phase of Transition-metal Compounds
Domain Resolved nano-ARPES Study on Orbital Ordered Phase of Transition-metal Compounds Open
Angle-resolved photoemission spectromicroscopy with submicron resolution (nano-ARPES) is a powerful technique to study electronic structure of microcrystals and microdomains. Transition-metal compounds such as FeTe and IrTe2 exhibit unique…
View article: Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe
Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe Open
We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within $\pm$20 fs of the …
View article: Domain dependent Fermi arcs observed in a striped phase dichalcogenide
Domain dependent Fermi arcs observed in a striped phase dichalcogenide Open
Angle-resolved photoemission spectromicroscopy on IrTe2 reveals evolution of mesoscopic striped domains across its first order phase transition at about 280 K. The striped texture of the domains is characterized by a herringbone arrangemen…
View article: The Local Structure of the BiS2 Layer in RE(O,F)BiS2 Determined by In-Plane Polarized X-ray Absorption Measurements
The Local Structure of the BiS2 Layer in RE(O,F)BiS2 Determined by In-Plane Polarized X-ray Absorption Measurements Open
We have investigated the local structure of BiS2-based layered materials by Bi L3-edge extended X-ray absorption fine structure (EXAFS) measurements performed on single crystal samples with polarization of the X-ray beam parallel to the Bi…
View article: Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe<sub>4</sub>As<sub>4</sub> Iron-Based Superconductor
Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe<sub>4</sub>As<sub>4</sub> Iron-Based Superconductor Open
Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Fe Kβ X-ray emission spectroscopy (XES) measurements are used to study the local structure and local Fe magnetic moment in the self-doped CaKFe4As4 superc…
View article: Detecting electron-phonon coupling during photoinduced phase transition
Detecting electron-phonon coupling during photoinduced phase transition Open
Photo-induced phase transitions have been intensively studied owing to the\nability to control a material of interest in the ultrafast manner, which can\ninduce exotic phases unable to be attained at equilibrium. However, the key\nmechanis…
View article: Observation of Kondo hybridization with an orbital-selective Mott phase in 4d Ca2-xSrxRuO4
Observation of Kondo hybridization with an orbital-selective Mott phase in 4d Ca2-xSrxRuO4 Open
The heavy fermion state with Kondo-hybridization (KH), usually manifested in f-electron systems with lanthanide or actinide elements, was recently discovered in several 3d transition metal compounds without f-electrons. However, KH has not…
View article: Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.10)
Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.10) Open
We report time-resolved angle-resolved photoemission study on Ta2Ni1−xCoxSe5 (x = 0.10) in which the excitonic insulator (EI) transition temperature is reduced by Co substitution for Ni. In the photoinduced phase, the conduction band is cl…