The Mercerau effect in Josephson point-contact junctions based on YBa2Cu3O7-δ at nitrogen temperatures
Aminov B. A., Borisovskii V. V., Brandt N. B., Muller R., Nguen Min Thu, Ponomarev Ya. G., Sudakova M. V., Graboi I. E., Kaul' A. R., Tret'yakov Yu. D.
The current-voltage characteristics of Josephson point-contact junctions based on YBa2Cu307_(5 have been studied over a broad temperature interval. Contacts of various geometries were found to exhibit interference effects in a magnetic field at nitrogen temperatures. The Mercerau oscillation frequency of a double-contact interferometer with an effective circuit diameter of ~ 8 μπ\ was found to increase upon approaching Tc because of the increase in the penetration depth of the magnetic field, λ (Τ).