Prof Jeevak Parpia gives a webinar on 'Path-Dependent Supercooling of the 3He Superfluid A-B transition' at 4pm UK time

Prof Jeevak Parpia (Cornell University) gives a webinar on “Path-Dependent Supercooling of the ³He Superfluid A-B transition” at 4pm UK time.

We have observed the discontinuous first-order superfluid ³He A to B transition in the vicinity of the polycritical point (2.232 mK and 21.22 bar). We find path-dependent transitions in a small-volume bulk sample: cooling at fixed pressure yields a well defined transition line in the temperature-pressure plane, but this line can be reliably crossed by depressurizing at nearly constant temperature after transiting T_c at a higher pressure. This path dependence is not consistent with any of the standard B-phase nucleation mechanisms in the literature.

Presenter: Jeevak Parpia, Department of Physics and LASSP, Cornell University, Ithaca NY, USA

Co-authors: Dmytro Lotnyk, Anna Eyal, Nikolay Zhelev, Abhilash Sebastian, Yefan Tian, Aldo Chavez, Eric Smith, John Saunders, Erich Mueller