A.A.Kozlovsky, V.P.Seminozhenko, V.F.Khirny
Received December 24, 1997
Boundary conditions in a
HTSC sample of bismuth-lead ceramics have been studied within the temperature
region near Tc. Data on changes in the ordering parameter value
near the superconductor surface have been obtained by analysing temperature
dependences of critical currents determined from volt-ampere characteristics
as well as using the magnetic method. The distinction between the ordering
parameter values near the sample surface and in its volume has been confirmed
in experiment. Temperature dependence of the ratio between ordering parameter
values near the surface and in the volume has been determined.