6533b85ffe1ef96bd12c0f16

RESEARCH PRODUCT

Fermi Liquid with Fermion Condensate

subject

description

Here we discuss the general properties of FCQPT leading to the emergence of FC. We present a microscopic derivation of the main equations of FC, and show that Fermi systems with FC form an entirely new class of Fermi liquids with its own topological structure, protecting the FC state. We construct the phase diagram, and explore the order parameter of these systems. We show that the fermion condensate has a strong impact on the observable physical properties of systems, where it is realized, up to relatively high temperatures of a few tens kelvin. Two different scenarios of the quantum critical point (QCP), a zero-temperature instability of the Landau state, related to the divergence of the effective mass, are also investigated. Flaws of the standard scenario of the QCP, where this divergence is attributed to the occurrence of some second–order phase transition, are demonstrated.