We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
MgB[sub2] SUPERCONDUCTIVITY PROPERTIES IN A TWO-GAP MODEL.
- Authors
Öbrd, T.; Kristoffel, N.; Rägo, K.
- Abstract
For MgB[sub 2] where coexist two coupled superconductivity gaps a two-band scheme has been developed. Three interaction channels have been taken into account: a pair-transfer type σ - π-interband repulsion, a σ-intraband effective attraction of electron-phonon nature, and a σ-intraband Coulomb interaction. By means of simultaneous fitting of T[sub c], specific heat jump and zero-temperature gaps ratio the optimal values of interaction constants have been found. The T[sub c] isotope effect exponent, the temperature dependencies of gaps and the thermodynamic characteristics (specific heat, H[sub c2]) calculated agree with the experimental findings. The theoretical curve of T[sub c] vs chemical potential reproduces qualitatively the influence of doping on superconductivity phase transition in MgB[sub 2].
- Subjects
SUPERCONDUCTIVITY; COULOMB functions
- Publication
Modern Physics Letters B, 2003, Vol 17, Issue 10-12, p667
- ISSN
0217-9849
- Publication type
Article