The low-temperature collapse of the Fermi surface and phase transitions in correlated Fermi systems

Details The low-temperature collapse of the Fermi surface and phase transitions in correlated Fermi systems The low-temperature collapse of the Fermi surface and phase transitions in correlated Fermi systems

2011-08-24

arxiv.org/abs/1108.4761v2

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, added figure

Scientific paper

A topological crossover, associated with the collapse of the Fermi surface in strongly correlated Fermi systems, is examined. It is demonstrated that in these systems, the temperature domain where standard Fermi liquid results hold dramatically narrows, because the Landau regime is replaced by a classical one. The impact of the collapse of the Fermi surface on pairing correlations is analyzed. In the domain of the Lifshitz phase diagram where the Fermi surface collapses, splitting of the BCS superconducting phase transition into two different ones of the same symmetry is shown to occur.

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