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‘Heat from Above’ Heat Capacity Measurements in Liquid ^4He

Lee, R. A. M. and Chatto, A. R. and Sergatskov, D. A. and Babkin, A. V. and Boyd, S. T. P. and Churilov, A. M. and McCarson, T. D. and Chui, T. C. P. and Day, P. K. and Duncan, R. V. and Goodstein, D. L. (2004) ‘Heat from Above’ Heat Capacity Measurements in Liquid ^4He. Journal of Low Temperature Physics, 134 (1/2). pp. 495-505. ISSN 0022-2291. doi:10.1023/B:JOLT.0000012601.63124.60.

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We have made heat capacity measurements of superfluid ^4He at temperatures very close to the lambda point, T_λ, in a constant heat flux, Q, when the helium sample is heated from above. In this configuration the helium enters a self-organized (SOC) heat transport state at a temperature T soc(Q), which for Q≥100 nW/cm^2 lies below T_λ. At low Q we observe little or no deviation from the Q=0 heat capacity up to T_(SOC)(Q); beyond this temperature the heat capacity appears to be sharply depressed, deviating dramatically from its bulk behaviour. This marks the formation and propagation of a SOC/superfluid two phase state, which we confirm with a simple model. The excellent agreement between data and model serves as an independent confirmation, of the existence of the SOC state. As Q is increased (up to 6 µW/cm^2) we observe a Q dependent depression in the heat capacity that occurs just below T_(SOC)(Q), when the entire sample is still superfluid, This is due to the emergence of a large thermal resistance in the sample, which we have measured and used to model the observed heat capacity depression. Our measurements of the superfluid thermal resistivity are a factor of ten larger than previous measurements by Baddar et al.

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Lee, R. A. M.0000-0001-6509-697X
Additional Information:© 2004 Plenum Publishing Corporation. We are grateful to Dr Alexa Harter for many helpful discussions. The research reported in this paper was carried out in collaboration between Caltech, The University of New Mexico and JPL, and was supported by the Fundamental Physics Discipline of the Microgravity Science Office of NASA.
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Issue or Number:1/2
Classification Code:PACS numbers: 67.40.Kh, 64.60.Ht, 67.40.Bz, 67.40.Pm
Record Number:CaltechAUTHORS:20151216-095248823
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62969
Deposited By: Ruth Sustaita
Deposited On:16 Dec 2015 19:42
Last Modified:10 Nov 2021 23:09

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