Low Temperature Physics: 36, 969 (2010); https://doi.org/10.1063/1.3518605 (5 pages)
Физика Низких Температур: Том 36, Выпуск 10-11 (Октябрь 2010), c. 1204-1209    ( к оглавлению , назад )

Josephson currents in point contacts between dirty two-band superconductors

Y.S. Yerin and A.N. Omelyanchouk

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: yerin@ilt.kharkov.ua

Received April 27, 2010


We developed microscopic theory of Josephson effect in point contacts between dirty two-band superconductors. The general expression for the Josephson current, which is valid for arbitrary temperatures, is obtained. This expression was used for calculation of current-phase relations and temperature dependences of critical current with application to MgB2 superconductor. Also we have considered influence on contact characteristics interband scattering effect appeared in case of dirty superconductors. It is shown that the correction to Josephson current due to the interband scattering depends on phase shift in the banks (i.e., s- or s±-wave symmetry of order parameters).

PACS: 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects;
PACS: 74.20.Mn Nonconventional mechanisms.

Key words: two-band superconductor, MgB2, Usadel equations, Josephson effect, current-phase relation, critical current.