Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-09-21
JETP Lett. 76, 532 (2002).
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, Revtex
Scientific paper
10.1134/1.1533781
We show that a strongly correlated Fermi system with the fermion condensate, which exhibits strong deviations from Landau Fermi liquid behavior, is driven into the Landau Fermi liquid by applying a small magnetic field $B$ at temperature T=0. This field-induced Landau Fermi liquid behavior provides the constancy of the Kadowaki-Woods ratio. A reentrance into the strongly correlated regime is observed if the magnetic field $B$ decreases to zero, then the effective mass $M^*$ diverges as $M^*\propto 1/\sqrt{B}$. At finite temperatures, the strongly correlated regime is restored at some temperature $T^*\propto\sqrt{B}$. This behavior is of general form and takes place in both three dimensional and two dimensional strongly correlated systems. We demonstrate that the observed $1/\sqrt{B}$ divergence of the effective mass and other specific features of heavy-fermion metals are accounted for by our consideration.
Pogorelov Yu. G.
Shaginyan Vasily R.
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