Melting, freezing and superfluidity of helium in porous media

Measurements of helium flow through tubes packed with powders of various sizes have been used to determine the onset of superfluidity, freezing and melting of helium confined in these media. For 500A particle size, overpressures of 3 bar above the bulk melting pressure were required to freeze the he...

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Bibliographic Details
Published inPhysica B + C Vol. 107; no. 1; pp. 585 - 586
Main Authors Smith, E.N., Brewer, D.F., Liezhao, Cao, Reppy, J.D.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.1981
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Summary:Measurements of helium flow through tubes packed with powders of various sizes have been used to determine the onset of superfluidity, freezing and melting of helium confined in these media. For 500A particle size, overpressures of 3 bar above the bulk melting pressure were required to freeze the helium, with remelting occurring at 2 bar above the bulk value. For smaller particle sizes, the superfluid transition temperature as a function of pressure was observed to follow a smooth curve to 3 bars above the melting curve, with no solidification seen at any temperature for pressures up to 30 bars. Similar suppression of solidification but by a lesser amount is seen in 3000A powders.
ISSN:0378-4363
DOI:10.1016/0378-4363(81)90595-7