Upper critical field $H_{c_2}$ in two-band superconductor

Details Upper critical field $H_{c_2}$ in two-band superconductor Upper critical field $H_{c_2}$ in two-band superconductor

2004-04-21

arxiv.org/abs/cond-mat/0404489v1

Physics

Condensed Matter

Superconductivity

13 pages, 1 figure in the text

Scientific paper

It was obtained the equation for the definition of upper critical field $% H_{c_2}$ in the system with two overlapping energetic bands on the Fermi surface, which is valid for the whole temperature interval $0 \leq T < T_c$. The analytic expressions for the value $H_{c_2}$ at $T \sim T_c$ and $T \ll T_c$ cases were defined. The possibility of changing the curvature $H_{c_2} (T)$ with changing of the electrons speed ratio $v_1 / v_2$ on different cavities on the Fermi surface was revealed. It was obtained the qualitative accordance with experimental data for the intermetallic compound $MgB_2$.

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