Superfluid Vorticity and 1/f Noise in Melting of Solid 4He |
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| Authors: | P. Hakonen O. Avenel E. Varoquaux |
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| Affiliation: | (1) CEA-DRECAM, Service de Physique de l'État Condensé, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France.;(2) CNRS-Laboratoire de Physique des Solides, Université Paris-Sud, Bât. 510, 91405 Orsay, France;(3) Low Temperature Laboratory, Helsinki University of Technology, 02150 Espoo, Finland |
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| Abstract: | One of the ways to reach a zero-vorticity state in superfluid4He is to melt solid helium slowly at temperatures well below T . This method takes advantage of the small density difference between the liquid and solid phases and of the high critical velocities for vortex formation at low T. However, pinning of the liquid-solid interface on the walls, revealed by 1/f-like pressure fluctuations of up to 1-10  bar in our setup, has consistently led to remanent vortex line densities of  4 · 103lines per cm2. |
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