Pseudogap phase formation in the crossover from Bose-Einstein condensation to BCS superconductivity

Abstract

A phase diagram for a 2D metal with variable carrier density has been derived. It consists of a normal phase, where the order parameter is absent; a so-called ``abnormal normal'' phase where this parameter is also absent but the mean number of composite bosons (bound pairs) exceeds the mean number of free fermions; a pseudogap phase where the absolute value of the order parameter gradually increases but its phase is a random value, and finally a superconducting (here Berezinskii-Kosterlitz-Thouless) phase. The characteristic transition temperatures between these phases are found. The chemical potential and paramagnetic susceptibility behavior as functions of the fermion density and the temperature are also studied. An attempt is made to qualitatively compare the resulting phase diagram with the features of underdoped high-$T_c$ superconducting compounds above their critical temperature.

26 pages, revtex, 5 EMTeX figures; more discussion and references added; to be published in JETP

References in corpus (3)

• Pseudogap effects induced by resonant pair scattering
• Ginzburg-Landau theory of superconductors with short coherence length
• Non-interacting Cooper pairs inside a pseudogap

Cited by in corpus (18)

• Phase Fluctuations and Pseudogap Phenomena
• BCS-BEC Crossover in 2D Fermi Gases with Rashba Spin-Orbit Coupling
• Quantum Phase Transition in the BCS-to-BEC Evolution of p-wave Fermi Gases
• Pairing fluctuations and pseudogaps in the attractive Hubbard model
• Berezinskii-Kosterlitz-Thouless transition in trapped quasi-two-dimensional Fermi gas near a Feshbach resonance
• Pseudogap and preformed pairs in the imbalanced Fermi gas in two dimensions
• Finite Temperature Time-Dependent Effective Theory for the Phase Field in two-dimensional d-wave Neutral Superconductor
• Superfluidity, Sound Velocity and Quasi Condensation in the 2D BCS-BEC Crossover
• Composite bosons in the 2D BCS-BEC crossover from Gaussian fluctuations
• BCS to Bose Crossover in Anisotropic Superconductors
• Nonlinear sigma model approach for chiral fluctuations and symmetry breakdown in Nambu-Jona-Lasinio model
• Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit coupled Fulde-Ferrell superfluid
• Thermodynamics of Crossover from Weak- to Strong-Coupling Superconductivity
• Spectral properties and pseudogaps in a model with d-wave pairing symmetry
• Phase Fluctuations and Pseudogap Properties: Influence of Nonmagnetic Impurities
• Quantum Phase Fluctuations Responsible for Pseudogap
• Peculiarities of electronic heat capacity of thulium cuprates in pseudogap state
• Demonstration of a robust pseudogap in a three-dimensional correlated electronic system