NMR on textural defects in superfluid3He-A

Abstract
Textural defects in the A phase are created in a slab geometry by an RF pulse and are stable in magnetic fields. The defects are observed as holes in NMR absorption signals with a field gradient and as a satellite peak in a homogeneous field. In order to create such defects, both the amplitude and the length of the RF pulse have to be larger than well defined thresholds.