Evidence for momentum-dependent heavy-fermionic electronic structures: Soft x-ray ARPES for the superconductor CeNi2Ge2 in the normal state
| Autor: | Yuichi Saitoh, Takeo Mori, Akira Sekiyama, Atsushi Tsuruta, Takashi Yamaguchi, Atsushi Yamasaki, Akira Yasui, Takayuki Kiss, H. Aratani, S. Tachibana, Hiroshi Yamagami, Hideki Fujiwara, Jun Miyawaki, Y. Nakatani, Takao Ebihara |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Superconductivity Soft x ray Condensed matter physics Photoemission spectroscopy Angle-resolved photoemission spectroscopy 02 engineering and technology Normal state Neutron scattering 021001 nanoscience & nanotechnology 01 natural sciences Momentum 0103 physical sciences Quasiparticle 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.97.115160 |
| Popis: | We present clear experimental evidence for the momentum-dependent heavy fermionic electronic structures of the $4f$-based strongly correlated system ${\mathrm{CeNi}}_{2}{\mathrm{Ge}}_{2}$ by soft x-ray angle-resolved photoemission spectroscopy. A comparison between the experimental three-dimensional quasiparticle dispersion of ${\mathrm{LaNi}}_{2}{\mathrm{Ge}}_{2}$ and ${\mathrm{CeNi}}_{2}{\mathrm{Ge}}_{2}$ has revealed that heavy fermionic electronic structures are seen in the region surrounding a specific momentum. Furthermore, the wave vectors between the observed ``heavy spots'' are consistent with a result of neutron scattering reflecting magnetic correlations, which could be a trigger for the superconductivity in ${\mathrm{CeNi}}_{2}{\mathrm{Ge}}_{2}$. |
| Databáze: | OpenAIRE |
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