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Vortex creation in the expansion of He II from just below the lambda transition.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>01/1996
<mark>Journal</mark>Czechoslovak Journal of Physics
Number of pages2
<mark>Original language</mark>English


Quantised vortices are created when Hell is expanded from a point close to, but slightly (about 3mK) below, the lambda transition. It is believed that these probably arise through conventional flow processes, caused by non-idealities in the design of the expansion system. Their density is smaller than that of vortices created via the Kibble mechanism in expansions passing through the transition; nonetheless, their presence inevitably reduces the accuracy of the latter experiments for modeling cosmic string creation. An investigation of the phenomenon with improved bolometry, is described and discussed.