Anisotropy of Critical Fields in MgB2: Two-Band Ginzburg-Landau Theory for Layered Superconductors

Creative Commons License

Askerzade İ., Tanatar B.

COMMUNICATIONS IN THEORETICAL PHYSICS, cilt.51, sa.3, ss.563-569, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 51 Sayı: 3
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1088/0253-6102/51/3/36
  • Dergi Adı: COMMUNICATIONS IN THEORETICAL PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.563-569
  • Anahtar Kelimeler: two-band superconductivity, Ginzburg-Landau theory, layered superconductors, critical magnetic fields, MAGNESIUM, DIBORIDE, YNI2B2C, MODEL
  • Ankara Üniversitesi Adresli: Evet

Özet

The temperature dependence of the anisotropy parameter of upper critical field gamma H-c2(T) = H-c2(parallel to)(T)/H-c2(perpendicular to)(T) and London penetration depth gamma lambda(T) = lambda(parallel to)(T)/lambda(perpendicular to)(T) are calculated using two-band Ginzburg-Landau theory for layered superconductors. It is shown that, with decreasing temperature the anisotropy parameter gamma H-c2(T) is increased, while the London penetration depth anisotropy gamma lambda(T) reveals an opposite behaviour. Results of our calculations are in agreement with experimental data for single crystal MgB2 and with other calculations. Results of an analysis of magnetic field H-c1 in a single vortex between superconducting layers are also presented.