Ginzburg-Landau theory: Application to the nonmagnetic borocarbides Lu(NiB)2C and Y(NiB)2C

ASKERBEYLİ İ.

Journal of the Korean Physical Society, cilt.43, sa.1, ss.111-117, 2003 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 1
  • Basım Tarihi: 2003
  • Dergi Adı: Journal of the Korean Physical Society
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.111-117
  • Anahtar Kelimeler: Ginzburg-Landau theory, Lower critical field, Nonmagnetic borocarbides, Two-band superconductivity, Upper critical field
  • Ankara Üniversitesi Adresli: Hayır

Özet

The temperature dependences of the upper critical field Hc2(T) and the lower critical field Hc1(T) for the superconducting nonmagnetic borocarbides Lu(NiB)2C and Y(NiB)2C is studied in the vicinity of Tc by using a two-band Ginzburg-Landau (G-L) theory. The temperature dependences of Hc2(T) and H c1(T) are nonlinear near Tc. The strength of the nonlinearity is mainly dependent on the interaction coupling between the order parameters of two separate bands. In addition, the inter-gradient interaction, as well as ratio of the effective masses of two separate bands, was found to be important in determining the temperature dependences. The results of the calculations are in good agreement with the experimental data for bulk Lu(NiB)2C and Y(NiB)2C.