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Robustness of the van Hove scenario for high-Tc superconductors
V. Yu. Irkhin, A. A. Katanin, M. I. Katsnelson
The pinning of the Fermi level to the van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group te…
Electronic Structure, Correlation Effects and Physical Properties of d- and f-Metals and Their Compounds
V. Yu. Irkhin, Yu. P. Irkhin
The book includes all main physical properties of d- and f-transition-metal systems and corresponding theoretical concepts. Especial attention is paid to the theory of magnetism an…
Thermodynamics of isotropic and anisotropic layered magnets: renormalization group approach and 1/N expansion
V. Yu. Irkhin, A. A. Katanin
The O(N) model of layered antiferro- and ferromagnets with a weak interlayer coupling and/or easy-axis anisotropy is considered. A renormalization group (RG) analysis in this model…
Critical behavior and the Neel temperature of quantum quasi-two-dimensional Heisenberg antiferromagnets
V. Yu. Irkhin, A. A. Katanin
The nonlinear sigma-model and its generalization on N-component spins, the O(N) model, are considered to describe thermodynamics of a quantum quasi-two-dimensional (quasi-2D) Heise…
1/N Expansion for Critical Exponents of Magnetic Phase Transitions in CP^{N-1} Model at 2<d<4
V. Yu. Irkhin, A. A. Katanin, M. I. Katsnelson
Critical exponents in the CP^{N-1} model, which describes localized-moment ferro- and antiferromagnets (N=2 in the Heisenberg model), are calculated from two-particle Green's funct…
On the Self-Consistent Spin-Wave Theory of Two-Dimensional Magnets With Impurities
V. Yu. Irkhin, A. A. Katanin, M. I. Katsnelson
The self-consistent spin-wave theory is applied to investigate the magnetization distribution around the impurity in isotropic and easy-axis two-dimensional ferro- and antiferromag…