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Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi$$_{2}$$Ge$$_{2}$$ in the normal state

運動量に依存したヘビーフェルミオン電子状態の証拠; 超伝導体CeNi$$_{2}$$Ge$$_{2}$$の常伝導状態における軟X線角度分解光電子分光

中谷 泰博*; 荒谷 秀和*; 藤原 秀紀*; 森 健雄*; 鶴田 篤史*; 橘 祥一*; 山口 貴司*; 木須 孝幸*; 山崎 篤志*; 保井 晃*; 山上 浩志; 宮脇 淳*; 海老原 孝雄*; 斎藤 祐児; 関山 明*

Nakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; Yamagami, Hiroshi; Miyawaki, Jun*; Ebihara, Takao*; Saito, Yuji; Sekiyama, Akira*

We present clear experimental evidence for the momentum-dependent heavy fermionic electronic structures of the 4${it f}$-based strongly correlated system CeNi$$_{2}$$Ge$$_{2}$$ by soft X-ray angle-resolved photoemission spectroscopy. A comparison between the experimental three-dimensional quasiparticle dispersion of LaNi$$_{2}$$Ge$$_{2}$$ and CeNi$$_{2}$$Ge$$_{2}$$ has revealed that heavy fermionic electronic structures are seen in the region surrounding at 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 of the superconductivity in CeNi$$_{2}$$Ge$$_{2}$$.

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パーセンタイル:59.26

分野:Materials Science, Multidisciplinary

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