On the Ginzburg-Landau Analysis of the Lower Critical Field Hc1 in MgB2

Askerbeyli İ., Gencer A., Güçlü N., Kýlýç A.

arxiv, cilt.1, sa.1, ss.1-10, 2002 (Hakemli Dergi) identifier

  • 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.