Vortex core contribution to textural energy in 3He-B below 0.4Tc

Details Vortex core contribution to textural energy in 3He-B below 0.4Tc Vortex core contribution to textural energy in 3He-B below 0.4Tc

2010-06-21

arxiv.org/abs/1006.4108v1

Physics

Condensed Matter

Other Condensed Matter

13 pages, 10 figures, submitted to proceedings of the QFS2010 conference

Scientific paper

Vortex lines affect the spatial order-parameter distribution in superfluid 3He-B owing to superflow circulating around vortex cores and due to the interaction of the order parameter in the core and in the bulk as a result of superfluid coherence over the whole volume. The step-like change of the latter contribution at 0.6Tc (at a pressure of 29bar) signifies the transition from axisymmetric cores at higher temperatures to broken-symmetry cores at lower temperatures. We extended earlier measurements of the core contribution to temperatures below 0.2Tc, in particular searching for a possible new core transition to lower symmetries. As a measuring tool we track the energy levels of magnon condensate states in a trap formed by the order-parameter texture.

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