Coca-Cola

Wölfle, Ralf

doi:10.3139/9783446221987.003

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“…The T-depende c described, within the framework of a new "critical Fermi liquid" theory, by ρ = ρ' 0 + a'T α , with α = ¾ [37].  Though the FS associated with the antiferromagnetically ordered phase of YbRh 2 Si 2 is assumed to be small (as argued below), the low-field Fermi liquid phase appears to be particularly heavy: Its quasiparticle mass even exceeds the one in the paramagnetic Fermi liquid phase (see Fig.…”

Section: Non Fermi Liquid Effects In Ybrh 2 Simentioning

confidence: 99%

Evidence of a Kondo Destroying Quantum Critical Point in YbRh₂Si₂

et al. 2014

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The heavy-fermion metal YbRh 2 Si 2 is a weak antiferromagnet below T N = 0.07 K. Application of a low magnetic field B c = 0.06 T (c) is sufficient to continuously suppress the antiferromagnetic (AF) order. Below T  10 K, the Sommerfeld coefficient of the electronic specific heat γ(T) exhibits a logarithmic divergence. At T < 0.3K, γ(T) ~ T -ε (ε: 0.3 -0.4), while the electrical resistivity ρ(T) = ρ 0 + aT (ρ 0 : residual resistivity). Upon extrapolating finite-T data of transport and thermodynamic quantities to T = 0, one observes (i) a vanishing of the "Fermi surface crossover" scale T*(B), (ii) an abrupt jump of the initial Hall coefficient R H (B) and (iii) a violation of the Wiedemann Franz law at B = B c , the field-induced quantum critical point (QCP). These observations are interpreted as evidence of a critical destruction of the heavy quasiparticles, i.e., propagating Kondo singlets, at the QCP of this material.

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Section: Non Fermi Liquid Effects In Ybrh 2 Simentioning

confidence: 99%