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

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-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 $_{2}$ .

Language	:	English
Journal	:	Physical Review B
Volume	:	97
Number	:	11
Pages	:	p.115160_1 - 115160_7
Publication Year/Month	:	2018/03
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PDF	:	AA2018-0003.pdf:1.65MB
Paper URL	:	https://doi.org/10.1103/PhysRevB.97.115160
DOI for research data	:
Keywords	:	軟X線角度分解光電子分光; 重い電子系超伝導体; CeNi $_{2}$ Ge $_{2}$
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	大阪大学

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Registration No. : AA20180003
JAEA Abstracts No. : 46000461
Paper Submission No. : 20058

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Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNiGe in the normal state

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