Impact of the ground-state 4f symmetry for anisotropic cf hybridization in the heavy-fermion superconductor CeNi2Ge2
H. Fujiwara, Y. Nakatani, H. Aratani, Y. Kanai-Nakata, K. Yamagami, S. Hamamoto, T. Kiss, A. Yamasaki, A. Higashiya, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Yasui, H. Yamagami, J. Miyawaki, A. Miyake, T. Ebihara, Y. Saitoh, A. Sekiyama
DOI 10.1103/PhysRevB.108.165121 · Physical Review B
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Abstract
We report the ground-state symmetry of Ce 4f states in the heavy-fermion superconductor CeNi2Ge2, yielding anisotropic cf hybridization between Ce 4f states and conducting electrons. By analyzing linear dichroism in soft x-ray absorption and core-level hard x-ray photoemission spectra, the 4f symmetry is determined as Σ-type Γ7, promoting predominant hybridization with the conducting electrons originating from the Ge site. The band structures probed by soft x-ray angle-resolved photoemission indicate that Ge 4p components contribute to band renormalization through anisotropic hybridization effects, suggesting that control of the electronic structures of a Ge orbital helps to achieve the exotic phenomena 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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