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IJPAP Vol.42(05) [May 2004] >

Title: Four-level approximation in disordered medium
Authors: Sakwa, W T
Khanna, K M
Mueni, M
Rotich, S
Torongey, P K
Keywords: Superfluidity
Disordered medium
Four-level approximation
Issue Date: May-2004
Publisher: CSIR
IPC CodeH01B 12/00
Abstract: The adsorption of superfluid 4He into a disordered medium, the disappearance of superfluidity due to adsorption, and the subsequent appearance of superfluidity when more 4He flows into the disordered medium have been described by the four-level approximation. The adsorption of superfluid 4He into a disordered medium depletes the ZMS as the particles shift to higher excited levels resulting in ‘four-level approximation’. Superfluidity reappears on further adsorption but at a lower temperature implying that the Tc value of a four-level system should be lower than the Tc value for a three-level system, which is in agreement with the experimental observations.
Page(s): 355-360
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(05) [May 2004]

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