Low-temperature collapse of the Fermi surface and phase transitions in correlated Fermi systems |
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Authors: | V A Khodel |
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Institution: | 1.National Research Centre Kurchatov Institute,Moscow,Russia;2.McDonnell Center for the Space Science and Department of Physics,Washington University,St. Louis,USA |
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Abstract: | 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 Ferrai 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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