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H. Fujiwara,Y. Nakatani,H. Aratani,Y. Kanai-Nakata,K. Yamagami,S. Hamamoto,T. Kiss,A. Sekiyama,A. Tanaka,T. Ebihara,Y. Saitoh 한국물리학회 2023 새물리 Vol.73 No.12
We have performed the soft x-ray absorption spectroscopy (XAS) on the heavy fermion superconductor CeNi₂Ge₂ to examine the local 4f electronic structures. The XAS spectra are qualitatively explained by the ionic calculation, indicating the localized character of the 4f states, while the sizable cf-hybridization effects are also observed in the XAS spectra and those magnetic circular dichroism. In addition, the temperature dependence of linear dichroism (LD) in the XAS spectra indicates that the ground state symmetry is Γ<SUB>7</SUB>, and the excited states with Γ<SUB>6</SUB> symmetry is above 390 K.