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

Research output: Contribution to journalJournal article

Published

Journal publication date01/1996
JournalCzechoslovak Journal of Physics
Journal numberSupple
Volume46
Number of pages2
Pages43-44
Original languageEnglish

Abstract

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.