Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phenomenology of ESR in heavy fermion systems: Fermi liquid and
  non-Fermi liquid regime   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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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-fin