Jezek, Dora M.Guilleumas, MontserratPi Pericay, MartíBarranco Gómez, Manuel2009-12-242009-12-2419970163-1829https://hdl.handle.net/2445/10504At low temperatures and He concentrations below -6.6%, there is experimental evidence about the existence in liquid helium mixtures of stable vortices with He-rich cores. When the system is either supersaturated or submitted to a tensile strength, vortices lose stability becoming metastable and eventually completely unstable, so that their cores freely expand. Within a density functional approach, we have determined the pressure- He concentration curve along which this instability appears at zero temperature.4 p.application/pdfeng(c) The American Physical Society, 1997Heli líquidTemperatures baixesLiquid heliumLow temperaturesinfo:eu-repo/semantics/article194488info:eu-repo/semantics/openAccess