Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-04-06
Phys. Rev. B 61, 14640 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, RevTeX, 4 Postscript figures. Extended version
Scientific paper
10.1103/PhysRevB.61.14640
A scaling consideration of the Kondo lattices is performed with account of singularities in the spin excitation spectral function. It is shown that a non-Fermi-liquid (NFL) behavior between two critical values of the bare $s-f$ coupling constant occurs naturally for complicated magnetic structures with several magnon branches. This may explain the fact that a NFL behavior takes place often in the heavy-fermion systems with peculiar spin dynamics. Another kind of a NFL-like state (with different critical exponents) can occur for simple antiferromagnets with account of magnon damping, and for paramagnets, especially with two-dimensional character of spin fluctuations. The mechanisms proposed lead to some predictions about behavior of specific heat, resistivity, magnetic susceptibility, and anisotropy parameter, which can be verified experimentally.
Irkhin Yu. V.
Katsnelson Mikhail I.
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