Ginzburg-Landau equations for the extended saddle-point model

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.446· OSTI ID:664417

Abrikosov, A A ^[1]

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1. Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)

Ginzburg-Landau-type equations are derived describing the model of tetragonal high-temperature superconducting cuprates based on the dominant role of extended saddle-point singularities in the electron spectrum and the assumption that the interaction between electrons consists of a strong long-range phonon-mediated attraction and a weak short-range repulsion. The connection between CuO{sub 2} layers is assumed to be established by resonant tunneling. As an example, the temperature dependence of the upper critical field along the c axis is calculated, which appears to have a positive curvature, as observed in many experiments. This is explained by the fact that with departure from T{sub c} the connection between different singular points becomes increasingly less important, and the electrons become more one-dimensional. Other explanations are briefly discussed. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 664417
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COPPER OXIDES
CRITICAL FIELD
CRITICAL TEMPERATURE
ELECTRON-PHONON COUPLING
GINZBURG-LANDAU THEORY
HIGH-TC SUPERCONDUCTORS
LAYERS
ONE-DIMENSIONAL CALCULATIONS
PHONONS
TRANSITION TEMPERATURE
TUNNELING