61 citations · 249 across the 23 of their papers we have counts for
23 papers
Re-examination of electronic structure of dilute Kondo transition-metal ions substituted into a Heavy Fermion compound
Kou Takubo, Shintaro Suzuki, Kohei Yamamoto +9
Correlations between the localized and conductive spins/charges have been the central issue of various fascinating quantum phenomena found on itinerant electron systems. Here, the…
Recent Progress in Ultrafast Dynamics of Transition-Metal Compounds Studied by Time-Resolved X-ray Techniques
Hiroki Wadati, Kohei Yamamoto, Kohei Yamagami
X-ray absorption spectroscopy and X-ray magnetic circular dichroism have long served as indispensable tools for probing the electronic and magnetic properties of transition-metal c…
Photo-induced phase transition on black samarium monosulfide
Hiroshi Watanabe, Yusuke Takeno, Yusuke Negoro +14
To investigate the role of the excitons for the origin of the pressure-induced phase transition (BGT) from the black-colored insulator (BI) to the golden-yellow-colored metal (GM)…
4 electron temperature driven ultrafast electron localization
Kohei Yamagami, Hiroki Ueda, Urs Staub +9
Valence transitions in strongly correlated electron systems are caused by orbital hybridization and Coulomb interactions between localized and delocalized electrons. The transition…
Impact of the ground-state symmetry for anisotropic -hybridization in the heavy fermion superconductor CeNiGe
H. Fujiwara, Y. Nakatani, H. Aratani +18
We report the ground-state symmetry of the Ce states in the heavy fermion superconductor CeNiGe, yielding anisotropic -hybridization between the Ce states…
Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of -Stacked Crystals
Hiroaki Tanaka, Shota Okazaki, Masaru Kobayashi +10
We investigate the electronic structure of - and - by angle-resolved photoemission spectroscopy (ARPES) and photoemission intensity cal…
Imaging emergent exotic quasiparticle state in a frustrated transition metal oxide
Yuita Fujisawa, Anjana Krishnadas, Chia-Hsiu Hsu +10
The existence of rich Fermiology in anomalous metal phase in exotic superconductors has attracted considerable interests, as exemplified in copper, iron-based, and intermetallic fr…
Photocarrier Transport of Ferroelectric Photovoltaic Thin Films Detected by the Magnetic Dynamics of Adjacent Ferromagnetic Layers
Yujun Zhang, Ji Ma, Keisuke Ikeda +7
We have observed photocarrier transport behaviors in BiFeO/LaSrMnO~(BFO/LSMO) heterostructures by using time-resolved synchrotron x-ray magnetic circular dichro…
Widely Tunable Berry curvature in the Magnetic Semimetal Cr1+dTe2
Y. Fujisawa, M. Pardo-Almanza, C. H. Hsu +8
Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin-based topological phenomena in real and momentum spaces. Of particular interest is the emergence o…
Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCoO Thin Film
Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu +9
We investigate both the ferromagnetic (FM) and antiferromagnetic (AFM) ultrafast dynamics of a strongly correlated oxide system, GdBaCoO thin film, by time-resolved x-r…
Hard x-ray photoemission study on strain effect in LaNiO thin films
K. Yamagami, K. Ikeda, A. Hariki +7
The strain effect from a substrate is an important experimental route to control electronic and magnetic properties in transition-metal oxide (TMO) thin films. Using hard x-ray pho…
Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2
K. Yamagami, Y. Fujisawa, B. Driesen +15
We investigate near-Fermi-energy (EF) element-specific electronic and spin states of ferromagnetic van der Waals (vdW) metal Fe5GeTe2. The soft x-ray angle-resolved photoemission s…
Tailoring Magnetism in Self-intercalated Cr1+δTe2 Epitaxial Films
Y. Fujisawa, M. Pardo-Almanza, J. Garland +13
Magnetic transition metal dichalcogenide (TMD) films have recently emerged as promising candidates to host novel magnetic phases relevant to next-generation spintronic devices. How…
Revisiting the phase diagram of T*-type LaEuSrCuO using Oxygen -edge X-ray absorption spectroscopy
Shun Asano, Kenji Ishii, Kohei Yamagami +3
Oxygen -edge X-ray absorption spectroscopy measurements were conducted on T*-type LaEuSrCuO (LESCO) to estimate the hole density () and in…
The Prominent Charge-Transfer Effects of Trinuclear Complexes with Nominally High Nickel Valences
K. Yamagami, S. Imada, K. Yamanaka +6
Recently synthesized Rh-Ni trinuclear complexes hexacoordinated with sulfur ions, 3-aminopropanethiolate (apt) metalloligand [Ni{Rh(apt)}](NO) ( = 2, 3,…
Interfacial-hybridization-modified Ir Ferromagnetism and Electronic Structure in LaMnO/SrIrO Superlattices
Yujun Zhang, Yong Zheng Luo, Liang Wu +19
Artificially fabricated 3/5 superlattices (SLs) involve both strong electron correlation and spin-orbit coupling in one material by means of interfacial 3-5 coupling, w…
Localized character of charge excitations for LaSrNiO revealed by oxygen -edge resonant inelastic X-ray scattering
Kohei Yamagami, Kenji Ishii, Yasuyuki Hirata +7
We performed a resonant inelastic X-ray scattering (RIXS) study of LaSrNiO (LSNO) at the oxygen edge to investigate the nature of the doped holes with reg…
Effect of Anisotropic Hybridization in YbAlB Probed by Linear Dichroism in Core-Level Hard X-ray Photoemission Spectroscopy
Kentaro Kuga, Yuina Kanai, Hidenori Fujiwara +14
We have probed the crystalline electric-field ground states of pure as well as the anisotropic - hybridization in both valence fluctuating sy…
Linear dichroism in angle-resolved core-level photoemission spectra reflecting 4f ground-state symmetry of strongly correlated cubic Pr compounds
Satoru Hamamoto, Shuhei Fujioka, Yuina Kanai +17
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 d…
Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates
A. Yamasaki, H. Fujiwara, S. Tachibana +19
In this study, we systematically investigate 3D momentum()-resolved electronic structures of Ruddlesden-Popper-type iridium oxides SrIrO using soft-x-…
Local 3d Electronic Structures of Co-Based Complexes with Medicinal Molecules Probed by Soft X-Ray Absorption
Kohei Yamagami, Hidenori Fujiwara, Shin Imada +8
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(t…
Evidence for Gamma_8 Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission
Yuina Kanai, Takeo Mori, Sho Naimen +12
We have successfully observed linear dichroism in angle-resolved Yb3+ 3d5/2 core-level photoemission spectra for YbB12 in cubic symmetry. Its anisotropic 4f charge distribution due…
Probing Strongly Correlated 4f-Orbital Symmetry of the Ground State in Yb Compounds by Linear Dichroism in Core-Level Photoemission
Takeo Mori, Satoshi Kitayama, Yuina Kanai +19
We show that the strongly correlated 4f-orbital symmetry of the ground state is revealed by linear dichroism in core-level photoemission spectra as we have discovered for YbRh2Si2…