Evidence for momentum-dependent heavy-fermionic electronic structures: Soft x-ray ARPES for the superconductor CeNi2Ge2 in the normal state
Y. Nakatani, H. Aratani, H. Fujiwara, T. Mori, A. Tsuruta, S. Tachibana, T. Yamaguchi, T. Kiss, A. Yamasaki, A. Yasui, H. Yamagami, J. Miyawaki, T. Ebihara, Y. Saitoh, A. Sekiyama
DOI 10.1103/PhysRevB.97.115160 · Physical Review B
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Abstract
We present clear experimental evidence for the momentum-dependent heavy fermionic electronic structures of the 4f-based strongly correlated system CeNi2Ge2 by soft x-ray angle-resolved photoemission spectroscopy. A comparison between the experimental three-dimensional quasiparticle dispersion of LaNi2Ge2 and CeNi2Ge2 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 CeNi2Ge2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeNi2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.2 | Pressure unresolved | unknown |
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