Transition temperature for 4He liquid adsorbed in disordered media

For pure 4He liquid the superfluid fraction starts having a finite value at and below the lambda-transition temperature 2.176K, whereas for 4He in a disordered media the superfluid fraction starts having a finite value at 2.168K. a temperature that is lower compared to the temperature at which super...

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Published inIndian journal of pure & applied physics Vol. 42; no. 5; pp. 351 - 354
Main Authors Sakwa, W T, Khanna, K M, Mueni, M, Rotich, S, Torongey, P K
Format Journal Article
LanguageEnglish
Published 01.05.2004
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Summary:For pure 4He liquid the superfluid fraction starts having a finite value at and below the lambda-transition temperature 2.176K, whereas for 4He in a disordered media the superfluid fraction starts having a finite value at 2.168K. a temperature that is lower compared to the temperature at which superfluidity appears in pure 4He. Relations for transition temperatures for hoth cases that arc in agreement with experimental values have been obtained. Adsorption, which normally leads to a decrease in the degrees of freedom consequently results in a release of heat, which destroys superfluidity. Hence for the liquid 4He flowing into a disordered medium, the transition temperature is expected to be lower.
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ISSN:0019-5596