Phenomenology of ESR in heavy fermion systems: Fermi liquid and non-Fermi liquid regime

Abstract

We extend and apply a recent theory of the dynamical spin response of Anderson lattice systems to interpret ESR data on YbRh2Si2. Starting within a semiphenomenological Fermi liquid description at low temperatures T < Tx (a crossover temperature) and low magnetic fields B << Bx, we extend the description to the non-Fermi liquid regime by adopting a quasiparticle picture with effective mass and spin susceptibility varying logarithmically with energy/temperature, as observed in experiment. We find a sharp ESR resonance line slightly shifted from the local f-level resonance and broadened by quasiparticle scattering (taking unequal g-factors of conduction and f electrons) and by spin-lattice relaxation, both significantly reduced by the effect of ferromagnetic fluctuations. A detailed comparison of our theory with the data shows excellent agreement in the Fermi liquid regime. In the non-Fermi liquid regime we find a close relation of the T-dependence of the specific heat/spin susceptibility with the observed T-dependence of line shift and linewidth.

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References in corpus (4)

• Multiple energy scales at a quantum critical point
• Relevance of ferromagnetic correlations for the Electron Spin Resonance in Kondo lattice systems
• Electron spin resonance in Kondo systems
• Evolution of the Kondo state of YbRh2Si2 probed by high field ESR

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