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Magnetic fluctuations and self--energy effects in two--dimensional itinerant systems with van Hove singularity of electronic spectrum
P. A. Igoshev, V. Yu. Irkhin, A. A. Katanin
We investigate a competition of tendencies towards ferromagnetic and incommensurate order in two-dimensional fermionic systems within functional renormalization group technique usi…
Self-energy effects in the Polchinski and Wick-ordered renormalization-group approaches
A. A. Katanin
I discuss functional renormalization group (fRG) schemes, which allow for non-perturbative treatment of the self-energy effects and do not rely on the one-particle irreducible func…
Quasielastic neutron scattering from two dimensional antiferromagnets at a finite temperature
A. A. Katanin, O. P. Sushkov
We consider frequency dependence of the neutron scattering amplitude from a two-dimensional quantum antiferromagnet. It is well known that the long range order disappears at any fi…
Linear-Temperature Dependence of Static Magnetic Susceptibility in LaFeAsO from Dynamical Mean-Field Theory
S. L. Skornyakov, A. A. Katanin, V. I. Anisimov
In this Letter we report the LDA+DMFT (method combining Local Density Approximation with Dynamical Mean-Field Theory) results for magnetic properties of parent superconductor LaFeA…