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Pseudogap phase in high- T(c) superconductors

Devillard1, Ranninger

  • 1Centre de Physique Theorique de Marseille, C.P.T. Case 907, Centre National de la Recherche Scientifique, Luminy, 13288 Marseille Cedex 9, France.

Physical Review Letters
|September 16, 2000
PubMed
Summary

The superconducting state emerges through sequential crossovers. Electron pairing creates a pseudogap, followed by itinerant behavior and partial screening, culminating in superconductivity as temperature decreases.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Research

Background:

  • The transition to the superconducting state is complex.
  • Understanding the intermediate phases is crucial for materials science.

Purpose of the Study:

  • To describe the emergence of superconductivity as a series of crossover phenomena.
  • To analyze the superconducting state using the boson-fermion model.

Main Methods:

  • Analysis based on the boson-fermion model.
  • Investigating the crossover regime between two-dimensional (2D) and three-dimensional (3D) systems.

Main Results:

  • Uncorrelated electron pairing leads to a pseudogap at T(F).
  • Itinerant features and partial Meissner screening appear at T(B).
  • Superconductivity is achieved through pair condensation at T(c).

Conclusions:

  • The superconducting state approaches as a sequence of crossovers.
  • The boson-fermion model effectively describes these phenomena in the 2D-3D crossover regime.

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