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

Askerzade 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: nonmagnetic borocarbides, two-band superconductivity, Ginzburg-Landau theory, upper critical field, lower critical field, SUPERCONDUCTIVITY, LUNI2B2C, YNI2B2C, MGB2, STATE
  • Ankara Üniversitesi Adresli: Hayır

Özet

The temperature dependences of the upper critical field H-c2(T) and the lower critical field H-c1(T) for the superconducting nonmagnetic borocarbides Lu(NiB)(2)C and Y(NiB)(2)C is studied in the vicinity of T-c by using a two-band Ginzburg-Landau (G-L) theory. The temperature dependences of H-c2(T) and H-c1(T) are nonlinear near T-c. 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)(2)C and Y(NiB)(2)C.