Two-band Ginzburg-Landau theory for the lower critical field H-c1 in MgB2

Askerzade, İMAN; Gencer, ALİ; Guclu, N; Kilic, A

doi:10.1088/0953-2048/15/6/101

Two-band Ginzburg-Landau theory for the lower critical field H-c1 in MgB2

Askerzade İ., Gencer A., Guclu N., Kilic A.

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, cilt.15, sa.6, 2002 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 15 Sayı: 6
Basım Tarihi: 2002
Doi Numarası: 10.1088/0953-2048/15/6/101
Dergi Adı: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Ankara Üniversitesi Adresli: Evet

Özet

The temperature dependence of the lower critical field H-cl(T) for the superconducting magnesium diboride. MgB2. is studied in the vicinity of T, using a two-band Ginzburg-Landau (G-L) theory. The theoretically calculated H-cl(T) near T-c exhibits a negative curvature. The results are shown to be in good agreement with the experimental data. In addition, two-band G-L theory calculations give a temperature dependence of the Ginzburg-Landau parameter kappa(T) = lambda(T)/xi(T), which varies little with the temperature in a manner similar to the microscopic single-band BSC theory.