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Angle-resolved photoemission spectroscopy study of crystal electric field in heavy fermion compound CePt2In7

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arxiv 1910.10907 v2 pith:Z2MA64ZL submitted 2019-10-24 cond-mat.str-el cond-mat.supr-con

Yang Luo , Chen Zhang , Qi-Yi Wu , Fan-Ying Wu , Jiao-Jiao Song , W. Xia , Yanfeng Guo , Jan Rusz
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Peter M. Oppeneer Tomasz Durakiewicz Yin-Zou Zhao Hao Liu Shuang-Xing Zhu Ya-Hua Yuan Jun He Shi-Yong Tan Y. B. Huang Zhe Sun Yi Liu H. Y. Liu Yu-Xia Duan Jian-Qiao Meng
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classification cond-mat.str-elcond-mat.supr-con
keywords heavycrystalelectricfieldphotoemissionangle-resolvedcept2in7fermion
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The three-dimensional electronic structure and Ce 4f electrons of the heavy fermion superconductor CePt2In7 is investigated. Angle-resolved photoemission spectroscopy using variable photon energy establishes the existence of quasi-two and three dimensional Fermi surface topologies. Temperature-dependent 4d-4f on-resonance photoemission spectroscopies reveal that heavy quasiparticle bands begin to form at a temperature well above the characteristic (coherence) temperature T*. T* emergence may be closely related to crystal electric field splitting, particularly the low-lying heavy band formed by crystal electric field splitting.

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