Ginzburg-Landau theory for two-band isotropic s-wave superconductors

Askerzade İ.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, cilt.17, sa.16, ss.3001-3020, 2003 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 16
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1142/s0217979203015887
  • Dergi Adı: INTERNATIONAL JOURNAL OF MODERN PHYSICS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3001-3020
  • Anahtar Kelimeler: two-band superconductivity, Ginzburg-Landau theory, magnesium diboride, nonmagnetic borocarbides, UPPER CRITICAL-FIELD, MAGNETIC-FIELD, HEAT JUMP, MGB2, LUNI2B2C, YNI2B2C, MODEL, STATE, BORON
  • Ankara Üniversitesi Adresli: Hayır

Özet

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