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VOLUME 76 (2002) | ISSUE 8 | PAGE 614
Transition from non Fermi liquid behavior to Landau Fermi liquid behavior induced by magnetic fields
PACS: 71.10.Hf, 71.27.+a, 74.72.-h
Abstract
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 re-entrance 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.