CaltechAUTHORS
  A Caltech Library Service

Enhanced heat capacity and a new temperature instability in superfluid He-4 in the presence of a constant heat flux near T-lambda

Harter, Alexa W. and Lee, Richard A. M. and Chatto, Andrew and Wu, Xinkai and Chui, Talso C. P. and Goodstein, David L. (2000) Enhanced heat capacity and a new temperature instability in superfluid He-4 in the presence of a constant heat flux near T-lambda. Physical Review Letters, 84 (10). pp. 2195-2198. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:HARprl00

[img]
Preview
PDF - Published Version
See Usage Policy.

105Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:HARprl00

Abstract

We present the first experimental evidence that the heat capacity of superfluid 4He, at temperatures very close to the lambda point Tλ, is enhanced by a constant heat flux Q. The heat capacity at constant Q, CQ, is predicted to diverge at a temperature Tc(Q)<Tλ at which superflow becomes unstable. In agreement with previous measurements, we find that dissipation enters our cell at a temperature, TDAS(Q), below the theoretical value, Tc(Q). We argue that TDAS(Q) can be accounted for by a temperature instability at the cell wall, and is therefore distinct from Tc(Q). The excess heat capacity we measure has the predicted scaling behavior as a function of T and Q, but it is much larger than predicted by current theory.


Item Type:Article
ORCID:
AuthorORCID
Lee, Richard A. M.0000-0001-6509-697X
Additional Information:© 2000 The American Physical Society. Received 30 August 1999. We are grateful to P. Day for his help in the design of the cell, to G. Ahlers, R. Duncan, and R. Haussmann for providing us with their data, and to R. Duncan, R. Haussmann, and P. Weichman for many helpful discussions. The research reported in this paper was carried out in collaboration between Caltech and JPL under a contract with NASA.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:FLOW INDUCED ANOMALIES; KAPITZA RESISTANCE; TRANSITION; SINGULARITY; DEPRESSION; GOLD
Issue or Number:10
Record Number:CaltechAUTHORS:HARprl00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HARprl00
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.84.2195
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6026
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Nov 2006
Last Modified:12 Sep 2017 22:20

Repository Staff Only: item control page