Abstract
Vortices in {sup 3}He-{ital A} in low magnetic fields ({ital H}{le}20 mT) have been studied by ultrasonics. A first-order phase change between two vortex types, with dissimilar sound absorption, has been found. The magnetic field at the transition is on the order of the dipolar field {ital H}{sub {ital d}}. The observed change occurs between continuous vortex textures with different topological charges in the {bold {cflx d}} field (where {bold {cflx d}} is the magnetic anisotropy vector).
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