S. Imada
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View article: Hybridized and Localized 4f Electronic States of Nd-based Intermetallic Compounds in Cubic Symmetry Probed by High-Energy Photoemission
Hybridized and Localized 4f Electronic States of Nd-based Intermetallic Compounds in Cubic Symmetry Probed by High-Energy Photoemission Open
We have performed soft and hard X-ray photoemission spectroscopies on NdTi2Al20 and NdBe13 which show antiferromagnetic ordering at low temperatures. The Nd 3d core-level photoemission and Nd 3d-4f valence-band resonant photoemission spect…
View article: A Review on the Magnetovolume Effect of the Full Heusler Alloys Ni2MnZ (Z = In, Sn, Sb)
A Review on the Magnetovolume Effect of the Full Heusler Alloys Ni2MnZ (Z = In, Sn, Sb) Open
The full Heusler alloys Ni2MnZ (Z = In, Sn, Sb) exhibit ferromagnetic properties with a Curie temperature (TC) above room temperature. The magnetic properties of Ni2MnZ (Z = In, Sn, Sb) were studied through a combination of experiments and…
View article: Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments
Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments Open
Inorganic photochromic materials offer several advantages over organic compounds, including relatively inexpensive and higher thermal stability. However, tuning their color with the same component has remained a significant challenge. In t…
View article: Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments
Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments Open
Inorganic photochromic materials offer several advantages over organic compounds, including relatively inexpensive and higher thermal stability. However, tuning their color with the same component has remained a significant challenge. In t…
View article: Fingerprints of Mott and Slater gaps in the core-level photoemission spectra of antiferromagnetic iridates
Fingerprints of Mott and Slater gaps in the core-level photoemission spectra of antiferromagnetic iridates Open
We present Ir $4f$ core-level hard-x-ray photoemission spectroscopy (HAXPES) experiments conducted across antiferromagnetic (AFM) ordering transition in Ruddlesden-Popper iridates Sr$_2$IrO$_4$ and Sr$_3$Ir$_2$O$_7$. The Ir $4f$ spectra ex…
View article: Impact of the ground-state $4f$ symmetry for anisotropic $cf$-hybridization in the heavy fermion superconductor CeNi$_{2}$Ge$_{2}$
Impact of the ground-state $4f$ symmetry for anisotropic $cf$-hybridization in the heavy fermion superconductor CeNi$_{2}$Ge$_{2}$ Open
We report the ground-state symmetry of the Ce $4f$ states in the heavy fermion superconductor CeNi$_{2}$Ge$_{2}$, yielding anisotropic $cf$-hybridization between the Ce $4f$ states and conducting electrons. By analyzing linear dichroism in…
View article: Bulk superconductivity in Pb-substituted BiS$_{\bf 2}$-based compounds studied by hard-x-ray spectroscopy
Bulk superconductivity in Pb-substituted BiS$_{\bf 2}$-based compounds studied by hard-x-ray spectroscopy Open
In this study, we investigate the bulk electronic structure of Pb-substituted LaO$_{0.5}$F$_{0.5}$BiS$_2$ single crystals, using two types of hard-x-ray spectroscopy. High-energy-resolution fluorescence-detected x-ray absorption spectrosco…
View article: Anisotropic magnetization and electronic structure of the first-order ferrimagnet ErCo2 studied by polarization dependent hard X-ray photoemission spectroscopy
Anisotropic magnetization and electronic structure of the first-order ferrimagnet ErCo2 studied by polarization dependent hard X-ray photoemission spectroscopy Open
The first-order ferrimagnet ErCo2 attracts interest not only because of metamagnetism and magnetocaloric effect just above TC ≈ 32–34 K but also because it is closely related with the itinerant metamagnetism of YCo2 and LuCo2. We study the…
View article: Ground State Local 4<i>f</i> Symmetry of CeAgSb<sub>2</sub> Probed by Linearly Polarized Hard X-ray Photoemission
Ground State Local 4<i>f</i> Symmetry of CeAgSb<sub>2</sub> Probed by Linearly Polarized Hard X-ray Photoemission Open
We have performed a linearly polarized hard X-ray photoemission (HAXPES) for CeAgSb 2 in the paramagnetic phase.The Ce 3d 5/2 core-level HAXPES spectra show the linear dichroism, reflecting the orbital anisotropy of the 4 f states.The grou…
View article: Local 4<i>f</i>Electronic Structure in PrAg<sub>2</sub>In Studied by Polarized X-Ray Absorption and Photoemission Spectroscopy
Local 4<i>f</i>Electronic Structure in PrAg<sub>2</sub>In Studied by Polarized X-Ray Absorption and Photoemission Spectroscopy Open
The electronic structure of PrAg 2 In has been investigated by soft X-ray absorption spectroscopy (XAS) and linearly polarized hard X-ray photoemission spectroscopy (HAXPES).The Pr M 4,5 XAS shows that the Pr valence of PrAg 2 In is fully …
View article: Electronic States of LaAuSb<sub>2</sub> Studied by Soft X-Ray ARPES
Electronic States of LaAuSb<sub>2</sub> Studied by Soft X-Ray ARPES Open
Electronic band structure of LaAuSb 2 , which shows charge density wave (CDW) transition, is studied above the CDW transition temperature by means of soft X-ray angle resolved photoemission and the result was compared with the band structu…
View article: Electronic States of an Antiferromagnet CeCuSb<sub>2</sub> Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy
Electronic States of an Antiferromagnet CeCuSb<sub>2</sub> Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy Open
Band structure calculations were performed on the dense Kondo antiferromagnetic CeCuSb 2 and revealed that the essential contribution to the total density of state (DOS) around E F originates from Sb 5p-Ce 5d bands while the contribution o…
View article: Linear Dichroism in Angle-Resolved Core-Level Photoemission Spectra Reflecting 4<i>f</i>Ground-State Symmetry of Strongly Correlated Cubic Pr Compounds
Linear Dichroism in Angle-Resolved Core-Level Photoemission Spectra Reflecting 4<i>f</i>Ground-State Symmetry of Strongly Correlated Cubic Pr Compounds Open
We report experimentally observed linear dichroism in angle-resolved core-level photoemission spectra of PrIr2Zn20 and PrB6 in cubic symmetry. The different anisotropic 4f charge distributions between the compounds due to the crystalline-e…
View article: Local 3<i>d</i>Electronic Structures of Co-Based Complexes with Medicinal Molecules Probed by Soft X-ray Absorption
Local 3<i>d</i>Electronic Structures of Co-Based Complexes with Medicinal Molecules Probed by Soft X-ray Absorption Open
We have examined the local 3d electronic structures of Co-Au multinuclear complexes with the medicinal molecules D-penicillaminate (D-pen) [Co{Au(PPh3)(D-pen)}2]ClO4 and [Co3{Au3(tdme)(D-pen)3}2] by Co L_2,3-edge soft X-ray absorption (XAS…
View article: Polarized hard X-ray photoemission system with micro-positioning technique for probing ground-state symmetry of strongly correlated materials
Polarized hard X-ray photoemission system with micro-positioning technique for probing ground-state symmetry of strongly correlated materials Open
An angle-resolved linearly polarized hard X-ray photoemission spectroscopy (HAXPES) system has been developed to study the ground-state symmetry of strongly correlated materials. The linear polarization of the incoming X-ray beam is switch…
View article: Local 3d Electronic Structures of Co-Au Multinuclear Complexes with Medicinal Molecules Probed by Soft X-ray Absorption
Local 3d Electronic Structures of Co-Au Multinuclear Complexes with Medicinal Molecules Probed by Soft X-ray Absorption Open
We have examined local 3d electronic structures of Co-Au multinuclear complexes with medicinal molecules D-penicillaminate (D-pen) [Co{Au(PPh3)(D-pen)}2]ClO4 and [Co3{Au3(tdme)(D-pen)3}2] by means of Co L-edge soft X-ray absorption (XAS) s…
View article: Photoemission System with Polarized Hard X-rays for Probing Ground State Symmetry of Strongly Correlated Materials
Photoemission System with Polarized Hard X-rays for Probing Ground State Symmetry of Strongly Correlated Materials Open
We have developed a polarized hard X-ray photoemission (HAXPES) system to study the ground-state symmetry of strongly correlated materials. The linear polarization of the incoming X-ray beam is switched by the transmission-type phase retar…
View article: Hole Doping Effects on Physical Properties of the Layered Antiferromagnetic Insulator (LaO)MnPn (Pn=P, As, Sb)
Hole Doping Effects on Physical Properties of the Layered Antiferromagnetic Insulator (LaO)MnPn (Pn=P, As, Sb) Open
We have investigated an insulating origin of the layered Mn oxypnictide (LaO)MnPn with half-filled Mn 3 d bands by choosing pnictogen atoms from P to Sb and introduction of hole carriers. Metallic states are found in (LaO)MnAs and (LaO)Mn…