Complete optical spectrum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeAl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Awasthi, A. M.; Degiorgi, L.; Grüner, G.; Dalichaouch, Y.; Maple, M. B.

doi:10.1103/physrevb.48.10692

Cited by 62 publications

(96 citation statements)

References 21 publications

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“…The ( ω) 2 behavior is indicated in 1/τ (ω) of many renormalized LFL metals, e.g. YbAl 3 [15], CePd 3 [12], and CeAl 3 [13]. At the same time, m * (ω) increases with decreasing T and ω indicating the formation of heavy quasiparticles at low temperatures.…”

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“…Then a narrow, renormalized peak at zero photon energy ω = 0 eV is formed and a socalled hybridization gap appears which is related to the transition between the bonding and antibonding states resulting from the cf -hybridization. [8, 9, 10] The coherent part of the underlying strong electron-electron correlations are treated in an extended Drude model by renormalized and frequency dependent m * (ω)/m 0 and 1/τ (ω); [11,12,13,14] Here,σ(ω) is the complex optical conductivity derived from the Kramers-Kronig analysis (KKA) of the reflectivity spectrum R(ω). The LFL theory predicts a dynamical scattering rate 1/τ (ω) ∝ (2πk B T ) 2 + ( ω) 2 which also accounts for the electrical resistivity, ρ(T ), growing quadratically with temperature [11].…”

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Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

et al. 2006

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We report far-infrared optical properties of YbRh2Si2 for photon energies down to 2 meV and temperatures 0.4 -300 K. In the coherent heavy quasiparticle state, a linear dependence of the lowenergy scattering rate on both temperature and photon energy was found. We relate this distinct dynamical behavior different from that of Fermi liquid materials to the non-Fermi liquid nature of YbRh2Si2 which is due to its close vicinity to an antiferromagnetic quantum critical point.PACS numbers: 71.10. Hf, 71.27.+a, The investigation of 4f -containing metals by farinfrared optical spectroscopy provides valuable insight into the nature of strong electronic correlations. This in particular holds true for heavy fermion (HF) compounds where at low temperatures a weak 4f -conduction electron (cf -)hybridization generates mass-renormalized quasiparticles with a coherent ground state which is in many HF systems of the Landau Fermi liquid (LFL) type.[1] The quasiparticles influence thermodynamic quantities which are described in terms of a large effective mass m * exceeding the free electron mass m 0 by three orders of magnitude. Furthermore, in typical HF materials, below a single-ion Kondo temperature (T K ), the coherent state is characterized by a dynamical screening of the 4f magnetic moments through the conduction electrons. Several highly correlated metals exhibit so-called nonFermi liquid (NFL), i.e., strong deviations from a renormalized LFL behavior when T → 0 K. [1] The system YbRh 2 Si 2 studied in this paper is one of a few clean stoichiometric HF metals with pronounced NFL behavior at ambient pressure which is related to both antiferromagnetic (AF) as well as ferromagnetic quantum critical spin fluctuations in close proximity to an AF quantum critical point (QCP). [2, 3, 4] Those NFL effects manifest as a divergence of the 4f -derived increment to the specific heat ∆C/T ∝ − ln T and in the electrical resistivity ρ(T ) showing a power law exponent close to 1 in a temperature range substantially larger than one decade and extending up to T ≃ 10 K.[5] Transport and thermodynamic properties are consistent with a single-ion Kondo temperature T K = 25 K (associated with the crystallineelectric-field-derived doublet ground state [6]).The electrodynamical response of HF systems is characterized by an optical conductivity σ(ω) which follows at room temperature the classical Drude model [σ(ω) = N e 2 τ /m * (1 + ω 2 τ 2 ); N : charge carrier density] with frequency independent m * and scattering rate 1/τ . [7] At low temperatures, upon entering the coherent state, large deviations are observed which are caused by many-body effects. Then a narrow, renormalized peak at zero photon energy ω = 0 eV is formed and a socalled hybridization gap appears which is related to the transition between the bonding and antibonding states resulting from the cf -hybridization. [8, 9, 10] The coherent part of the underlying strong electron-electron correlations are treated in an extended Drude model by renormalized and frequency dependent m * (ω)...

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Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

et al. 2006

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“…2(b)), ascribed to the optical conductivity of the heavy quasiparticle. The narrow resonance can be fitted with a renormalized Drude expression [6,7]: Table I where m* and r* are effective mass of the heavy quasiparticles and the renormalized scattering time, respectively. The parameters of the fit at different temperatures are listed in Table I.…”

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Optical investigations of the electrodynamics of UPd2Al3

Dressel

Degiorgi²,

Grüner

et al. 1994

Physica B: Condensed Matter

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We have investigated the electrodynamic response of UPd2AIs. At low temperatures, we observe the formation of a low-frequency narrow resonance, which indicates the development of the many-body coherent state. We do not find any evidence of a gap absorption associated to a spin density wave state below the antiferromagnetic phase transition at TN = 14 K, which would develop as a consequence of a Fermi surface instability.

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“…The crossing at lower energy (ω * p ) is associated with heavy plasmons, the one at higher energy with the plasma energy of uncorrelated electrons [13]. Such analysis of ε 1 (ω) was considered, for instance, for CeAl 3 [14] or for the Ce-115 system [15]. For CeCu 2 Si 2 , see Fig.…”

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Far-infrared optical conductivity of CeCu₂Si₂

Sichelschmidt¹,

Herzog²,

Jeevan³

et al. 2013

J. Phys.: Condens. Matter

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Abstract.[Journal ref.: J. Phys.: Condens. Matter 25, 065602 (2013)] We investigated the optical reflectivity of the heavy-fermion metal CeCu 2 Si 2 in the energy range 3 meV -30 eV for temperatures between 4K -300K. The results for the charge dynamics indicate a behavior that is expected for the formation of a coherent heavy quasiparticle state: Upon cooling the spectra of the optical conductivity indicate a narrowing of the coherent response. Below temperatures of 30 K a considerable suppression of conductivity evolves below a peak structure at 13 meV. We assign this gap-like feature to strong electron correlations due to the 4f -conduction electron hybridization.

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Complete optical spectrum ofCeAl3

Cited by 62 publications

References 21 publications

Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

Optical investigations of the electrodynamics of UPd2Al3

Far-infrared optical conductivity of CeCu₂Si₂

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Complete optical spectrum ofCeAl3

Cited by 62 publications

References 21 publications

Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2

Optical investigations of the electrodynamics of UPd2Al3

Far-infrared optical conductivity of CeCu2Si2

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Far-infrared optical conductivity of CeCu₂Si₂