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arXiv · 1810.10837

Direct Evidence for the Existence of Heavy Quasiparticles in the Magnetically Ordered Phase of CeRhIn$_5$

Masahiro Haze·Robert Peters·Yohei Torii·Tomoka Suematsu·Daiki Sano·Masahiro Naritsuka·Yuichi Kasahara·Takasada Shibauchi·Takahito Terashima·Yuji Matsuda
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Abstract

It is a long-standing important issue in heavy fermion physics whether $f$-electrons are itinerant or localized when the magnetic order occurs. Here we report the {\it in situ} scanning tunneling microscopy observation of the electronic structure in epitaxial thin films of CeRhIn$_5$, a prototypical heavy fermion compound with antiferromagnetic ground state. The conductance spectra above the N\'eel temperature $T_N$ clearly resolve the energy gap due to the hybridization between local 4$f$ electrons and conduction bands as well as the crystal electric field excitations. These structures persist even below $T_N$. Moreover, an additional dip in the conductance spectra develops due to the antiferromagnetic order. These results provide direct evidence for the presence of itinerant heavy $f$-electrons participating in the Fermi surface even in the magnetically ordered state of CeRhIn$_5$.

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Masahiro Haze, Robert Peters, Yohei Torii, Tomoka Suematsu, Daiki Sano, Masahiro Naritsuka, Yuichi Kasahara, Takasada Shibauchi, Takahito Terashima, Yuji Matsuda. 2018-10-25. Direct Evidence for the Existence of Heavy Quasiparticles in the Magnetically Ordered Phase of CeRhIn$_5$. https://doi.org/10.7566/jpsj.88.014706

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