NMR absorption by vortices in the homogeneously precessing spin domain is discussed in terms of a torque, which arises from spin-orbit coupling between the coherently precessing spins and the nonuniformity in the orbital order parameter in the vortex core. A new soft mode of the nonaxisymmetric vort
Homogeneously precessing spin domain in rotating vortex-free 3HeB
✍ Scribed by J.S. Korhonen; V.V. Dmitriev; Z. Janu; Y. Kondo; M. Krusius; Yu.M. Mukharskiy
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 221 KB
- Volume
- 165-166
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
Superfluid counterflow in rotating vortex-free sHe-B induces distinct changes in the homogeneously precessing resonance domain: its volume is reduced and the NMR absorption increased. Both effects disappear if the domain fills the whole experimental cell.
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The measurement of cw NMR absorption in a homogeneously precessing spin domain of sHe-B is discussed. The absorptron is divided into several contributions, based upon their drfferent dependences on the domain length. Within our experimental accuracy, we found no contribution linear with domain size
At temperatures below 0.5T, we observed a sharp change in a shape and a duration of a free induction decay signal of sHe -B. Below thii temperature signal bears clear signs of instability. The onset temperature of thii phenomenon does not depend significantly on the pressure, the magnetic field or t
By creating a homogeneously precessing domain in sHe -B in a quadrupole RF field we have obtained a structure, which according to the theory must bear a circular spin supercurrent. This structure is analogous to a quantum vortex in 'He or a magnetic flux line in superconductors.