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Contrasting pressure evolution of f -electron hybridized states in CeRhIn5 and YbNi3 Ga9 : An optical conductivity study

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [4];  [5];  [5]
  1. Tokushima University (Japan)
  2. Kobe Univ. (Japan)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  4. Nagoya Inst. of Technology (Japan)
  5. Japan Synchrotron Radiation Research Institute, Sayo (Japan)
+ Show Author Affiliations

Optical conductivity [σ(ω)⁡] of CeRhIn5 and YbNi3⁢Ga9 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 YbNi3⁢Ga9, in contrast, a marked mIR peak is observed already at ambient pressure, indicating a strong c-f 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 YbNi3⁢Ga9 exhibit some opposite tendencies in the pressure evolution of σ(ω) and electronic structure. Further, these results are discussed in terms of the pressure evolution of c-f hybridized electronic states in Ce and Yb compounds, in particular in terms of the electron-hole symmetry often considered between Ce and Yb.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2523974
Report Number(s):
LA-UR--22-23895
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 19 Vol. 100; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Heavy-fermion systems
Infrared spectroscopy
Pressure techniques