Abstract
Attenuation and velocity measurements in low magnetic fields in the superconducting state of a melt-textured sample of YBa2Cu3O7 are reported. Changes in both attenuationα and relative velocitydv/v are observed at the penetration fieldH′ c1 of its domain boundaries. The change indv/v atH′ c1 appears to be proportional to the repulsive force between vortices. The change inα atH′ c1 may be produced by a relaxation process involving superconducting quasiparticles in the vicinity of the normal core of the vortices. Analysis of the relaxation time associated with this process yields a temperature-dependent energy gap which follows the BCS dependence. The relaxation time associated with the process is about 10−11 sec.
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