Abstract
Abstract Ultrasonic attenuation and velocity measurements as a function of magnetic field in the superconducting state of a melt-textured sample of YBa2Cu3O7 with Tc = 91 K are reported. Sharp rises in both attenuation α and relative velocity dv/v are observed at the penetration fields H′c1 of its domain boundaries. The change in dv/v at H′c1 is proportional to the repulsive force between vortices. The change in a at H′c1 is produced by a relaxation process involving the excitation and decay of superconducting quasiparticles in the vicinity of the normal core of the vortices. The relaxation time associated with this process yields the Burdeen-Cooper-Schrieffer temperature-dependent energy gap.
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