Ginzburg-Landau equations for two-band superconductors: Application to MgB2, LuNi2B2C and YNi2B2C

Askerzade İ.

PHYSICA SCRIPTA, cilt.69, sa.3, ss.234-243, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 69 Sayı: 3
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1238/physica.regular.069a00234
  • Dergi Adı: PHYSICA SCRIPTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.234-243
  • Ankara Üniversitesi Adresli: Hayır

Özet

Temperature dependences of the upper critical field H-c2(T), lower critical field H-c1(T), thermodynamic magnetic field H-cm(T) and critical current density j(c)(T) are studied in the vicinity of T-c by using a two-band Ginzburg-Landau (G-L) theory. The results are shown to be in good agreement with experimental data for the superconducting magnesium diboride. MgB2, and non-magnetic borocarbides LuNi2B2C, YNi2B2C. In addition, two-band G-L theory was applied for the calculation of specific heat jump. which is smaller than in single-band G-L theory. Peculiarities of Little-Parks effect in two-band G-L theory are studied also. It is shown that quantization of the magnetic flux and relation between surface magnetic field H-c3(T) and upper critical field H-c2(T) are the same as in single band G-L theory. Generalization of two-band Ginzburg-Landau theory to the layered case is discussed.