Publications by authors named "Daisuke Takegami"
Article Synopsis
- CeRh₂As₂ is identified as a new multiphase superconductor that potentially exhibits an additional itinerant multipolar ordered phase, which is unusual in heavy-fermion compounds.
- X-ray spectroscopy techniques such as core-level photoelectron and absorption spectroscopy have been used to confirm the presence of Kondo hybridization, indicating electron interactions that are critical for understanding its low-temperature properties.
- The study reveals how Kondo physics allows the coupling of Kramer's doublets into an effective quasiquartet state, with findings suggesting that the |Γ₇⁻⟩ state plays a significant role in the material's multiorbital ground state structure.
Al-Pt intermetallic compounds: HAXPES study.
Phys Chem Chem Phys
November 2023
Intermetallic compounds in the Al-Pt system were systematically studied hard X-ray photoelectron spectroscopy, focusing on the positions of Pt 4f and Al 2s core levels and valence band features. On one hand, with increasing Al content, the Pt 4f core levels shift towards higher binding energies (BE), revealing the influence of the atomic interactions (chemical bonding) on the electronic state of Pt. On the other hand, the charge transfer from Al to Pt increases with increasing Al content in Al-Pt compounds.
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- This study explores the dual nature of U electrons in various compounds (U M = Pd, Ni, Ru, Fe) using advanced X-ray techniques, revealing a mix of localized and delocalized states.
- The findings suggest a common atomic-like state defined by the U configuration, with variations in U 5f characteristics indicating a trend towards increased electron itineracy from Pd to Fe.
- These electronic states help explain significant magnetic behaviors and may guide future experiments aimed at inducing hidden order or superconductivity in similar U compounds.
Interplay of Atomic Interactions in the Intermetallic Semiconductor Be Pt.
Angew Chem Int Ed Engl
October 2019
Semiconducting substances form one of the most important families of functional materials. However, semiconductors containing only metals are very rare. The chemical mechanisms behind their ground-state properties are only partially understood.
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