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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

Abstract

We present THz range optical conductivity data of a thin film of the near quantum critical heavy-fermion compound CeFe 2Ge 2. 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 ~ T 2 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. CeFe 2Ge 2 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.

Authors:
 [1];  [1];  [2];  [2];  [2];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Gordon and Betty Moore Foundation
OSTI Identifier:
1371215
Alternate Identifier(s):
OSTI ID: 1236894
Grant/Contract Number:  
AC02-98CH10886; GBMF2628
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 8; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; energy storage (including batteries and capacitors); superconductivity; defects; spin dynamics; Kondo effect; optical conductivity; quantum-to-classical transition; heavy-fermion systems

Citation Formats

Bossé, G., Pan, LiDong, Li, Yize S., Greene, L. H., Eckstein, J., and Armitage, N. P. Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe2Ge2. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.085104.
Bossé, G., Pan, LiDong, Li, Yize S., Greene, L. H., Eckstein, J., & Armitage, N. P. Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe2Ge2. United States. doi:10.1103/PhysRevB.93.085104.
Bossé, G., Pan, LiDong, Li, Yize S., Greene, L. H., Eckstein, J., and Armitage, N. P. Wed . "Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe2Ge2". United States. doi:10.1103/PhysRevB.93.085104. https://www.osti.gov/servlets/purl/1371215.
@article{osti_1371215,
title = {Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion system CeFe2Ge2},
author = {Bossé, G. and Pan, LiDong and Li, Yize S. and Greene, L. H. and Eckstein, J. and Armitage, N. P.},
abstractNote = {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 ωn(T), where n(T) approaches ~1.0 ± 0.2 at 1.5 K. This is compared to the ρ ~ T1.5 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.},
doi = {10.1103/PhysRevB.93.085104},
journal = {Physical Review B},
number = 8,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}

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    Works referencing / citing this record:

    Study of frequency- and temperature-dependent electrical transport in heavy fermion systems
    journal, May 2017