The microscopic theory of the upper critical field Hc2 in two-band systems in the magnetic field directed parallel and perpendicular to the plane (ab). Application to MgB2
The microscopic superconductivity theory in 2 systems in the magnetic fields directed parallel and perpendicular to the plane (ab) is built. The two energy bands of different dimensions overlapping on the Fermi surface (two-dimensional σ - band and three- dimensional π -band) are taken into ac...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2008
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/cd541856fa0f4d52be96fe40c980ca1b |
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| Sumario: | The microscopic superconductivity theory in 2 systems in the magnetic fields directed parallel and perpendicular to the plane (ab) is built. The two energy bands of different
dimensions overlapping on the Fermi surface (two-dimensional σ - band and three-
dimensional π -band) are taken into account. The theory is built taking into account the weak
dispersion of the electron energy of σ -band in z direction.
The systems of equations for the superconductive transition temperature c T and the upper critical field
()0
2
ab
c H are obtained. The analytic solutions of the equations for
()0
2
ab
c H are found in the two temperature areas: nearby the zero temperature 0
c TT |
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