Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe2Ge2

Bossé, G.; Pan, LiDong; Li, Yize S.; Greene, L. H.; Eckstein, J.; Armitage, N. P.

doi:10.1103/PhysRevB.93.085104

Title: Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system ${CeFe}_{2} {Ge}_{2}$

Journal Article · Wed Feb 03 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.085104· OSTI ID:1371215

Bossé, G. ^[1]; Pan, LiDong ^[1]; Li, Yize S. ^[2]; Greene, L. H. ^[2]; Eckstein, J. ^[2]; Armitage, N. P. ^[1]

Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)

We present THz range optical conductivity data of a thin film of the near quantum critical heavy-fermion compound CeFe₂Ge₂. Our complex conductivity measurements find a deviation from conventional Drude-like transport in a temperature range previously reported to exhibit unconventional behavior. We calculate the frequency-dependent effective mass and scattering rate using an extended Drude model analysis. We find the inelastic scattering rate can be described by a temperature-dependent power law ω^n(T), where n(T) approaches ~1.0 ± 0.2 at 1.5 K. This is compared to the ρ ~ T^1.5 behavior claimed in dc resistivity data and the ρ ~ T² expected from Fermi-liquid theory. In addition to a low-temperature mass renormalization, we find an anomalous mass renormalization that persists to high temperature. Here, we attribute this to a Hund's coupling in the Fe states in a manner similar to that recently proposed in the ferropnictides. CeFe₂Ge₂ appears to be a very interesting system where one may study the interplay between the usual 4f lattice Kondo effect and this Hund's enhanced Kondo effect in the 3d states.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation

Grant/Contract Number:: AC02-98CH10886; GBMF2628

OSTI ID:: 1371215

Alternate ID(s):: OSTI ID: 1236894

Journal Information:: Physical Review B, Vol. 93, Issue 8; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe 2 Ge 2

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Title: Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system ${CeFe}_{2} {Ge}_{2}$