Effects of anisotropy on the critical temperature in layered nonadiabatic superconductors

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Askerzade İ., Tanatar B.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, cilt.384, sa.3, ss.404-410, 2003 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 384 Sayı: 3
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0921-4534(02)01995-0
  • Dergi Adı: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.404-410
  • Anahtar Kelimeler: nonadiabatic superconductors, electron-phonon interactions, layered systems, Migdal theorem, ELECTRON-PHONON INTERACTION, TRANSITION-TEMPERATURE, MIGDALS THEOREM, VERTEX CORRECTIONS, PENETRATION-DEPTH, BREAKDOWN, CONDUCTIVITY, ENERGY, STATE
  • Ankara Üniversitesi Adresli: Evet

Özet

The generalized anisotropic Eliashberg theory is employed to study the critical temperature of layered nonadiabatic superconductors where the relevant phonon energy is comparable to the Fermi energy. We consider a two-dimensional model appropriate for cuprate compounds and recently discovered superconductor magnesium-diboride (MgB2) which also reveals layered structure. By using the McMillan approximation we present the result of calculations of critical temperature T-c. It is shown that the critical temperature is enhanced due to the influence of anisotropy and nonadiabaticity. (C) 2002 Elsevier Science B.V. All rights reserved.