Ginzburg-Landau theory for two-band s-wave superconductors: application to non-magnetic borocarbides LuNi2B2C, YNi2B2C and magnesium diboride MgB2

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Atıf İçin Kopyala

Askerzade İ.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, cilt.397, sa.3-4, ss.99-111, 2003 (SCI-Expanded)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 397 Sayı: 3-4
• Basım Tarihi: 2003
• Doi Numarası: 10.1016/j.physc.2003.07.003
• Dergi Adı: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Sayfa Sayıları: ss.99-111
• 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 by using a two-band Ginzburg-Landau (G-L) theory. The results are shown to be in a 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. (C) 2003 Elsevier B.V. All rights reserved.