Contrasting pressure evolution of f-electron hybridized states in CeRhIn5 and YbNi3Ga9: An optical conductivity study

H. Okamura, A. Takigawa, T. Yamasaki, E. D. Bauer, S. Ohara, Y. Ikemoto, and T. Moriwaki
Phys. Rev. B 100, 195112 – Published 8 November 2019

Abstract

Optical conductivity [σ(ω)] of CeRhIn5 and YbNi3Ga9 have been measured at external pressures to 10 GPa and at low temperatures to 6 K. Regarding CeRhIn5, at ambient pressure the main feature in σ(ω) is a Drude peak due to free carriers. With increasing pressure, however, a characteristic midinfrared (mIR) peak rapidly develops in σ(ω), and its peak energy and width increase with pressure. These features are consistent with an increased conduction (c)-f electron hybridization at high pressure and show that pressure has tuned the electronic state of CeRhIn5 from very weakly to strongly hybridized ones. As for YbNi3Ga9, in contrast, a marked mIR peak is observed already at ambient pressure, indicating a strong cf hybridization. At high pressures, however, the mIR peak shifts to lower energy and becomes diminished and seems to merge with the Drude component at 10 GPa. Namely, CeRhIn5 and YbNi3Ga9 exhibit some opposite tendencies in the pressure evolution of σ(ω) and electronic structure. These results are discussed in terms of the pressure evolution of cf hybridized electronic states in Ce and Yb compounds, in particular in terms of the electron-hole symmetry often considered between Ce and Yb.

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  • Received 10 August 2019
  • Revised 15 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.195112

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Okamura*

  • Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8506, Japan

A. Takigawa and T. Yamasaki

  • Graduate School of Science, Kobe University, Kobe 657-8501, Japan

E. D. Bauer

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

S. Ohara

  • Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8585, Japan

Y. Ikemoto and T. Moriwaki

  • Japan Synchrotron Radiation Research Institute, Sayo 679-5198, Japan

  • *ho@tokushima-u.ac.jp

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Issue

Vol. 100, Iss. 19 — 15 November 2019

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