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Ginzburg‐Landau Equations and the Upper Critical Magnetic Field in Graphite Intercalation Compounds
Author(s) -
Konsin P.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221890121
Subject(s) - superconductivity , graphite , intercalation (chemistry) , condensed matter physics , critical field , magnetic field , field (mathematics) , landau quantization , physics , atmospheric temperature range , range (aeronautics) , phonon , ginzburg–landau theory , materials science , quantum mechanics , thermodynamics , mathematics , pure mathematics , composite material
The Ginzburg‐Landau equations of a dirty two‐band superconductor, where superconductivity is driven by the interband electron‐phonon interaction are derived. On using these Ginzburg‐Landau equations, the obtained formulas for the critical field H c2 describe well the temperature and angular dependences of H c2 in graphite intercalation compounds (GICs). The calculated H c2 ⟂ ∥ for C 6 K show a linear temperature dependence in a broad temperature range up to the values of the reduced temperature t = T / T c ≈ 0.3 which is a general feature of GICs.