Abstract
A new, low frequency ultrasound technique was used to investigate the viscous properties of the vortex system in an untwinned single crystal of YB${\mathrm{a}}_{2}$C${\mathrm{u}}_{3}$ ${\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$. With the magnetic field oriented parallel to the crystals Cu-O planes and vortex motion within the plane, pronounced field-dependent attenuation changes were observed in the superconducting state. These changes are indicative of transitions in the viscosity of the vortex system, leading to transitions from a soft vortex system at low fields to a rigid and collectively pinned vortex system at high fields.
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