On the Ginzburg-Landau Analysis of the Lower Critical Field Hc1 in MgB2
arxiv, cilt.1, sa.1, ss.1-10, 2002 (Hakemli Dergi)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 1 Sayı: 1
- Basım Tarihi: 2002
- Dergi Adı: arxiv
- Sayfa Sayıları: ss.1-10
- Ankara Üniversitesi Adresli: Hayır
Özet
Temperature dependence of the lower critical field Hc1 (T) for the superconducting magnesium diboride, MgB2, is studied in the vicinity of Tc by using a two-band Ginzburg-Landau (G-L) theory. Theoretically calculated Hc1 (T) near Tc exhibits a negative curvature. The results are shown to be in a good agreement with the experimental data. In addition, two-band G-L theory calculations give a temperature dependence of the Ginzburg-Landau parameter, which varies little with temperature as in a similar manner of the microscopic single-band BSC theory.