Measurement of the SOC state specific heat in 4He

A. R. Chatto, R. A.M. Lee, R. V. Duncan, P. K. Day, D. L. Goodstein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

When a heat flux Q is applied downward through a sample of liquid 4He near the lambda transition, the helium self organizes such that the gradient in temperature matches the gravity induced gradient in T λ. All the helium in the sample is then at the same reduced temperature tSOC=TSOC-TλT λ and the helium is said to be in the Self-Organized Critical (SOC) state. We have made preliminary measurements of the 4He SOC state specific heat, C∇T(T(Q)). Despite having a cell height of 2.54 cm, our results show no difference between C∇T and the zero-gravity 4He specific heat results of the Lambda Point Experiment (LPE) [J.A. Lipa et al., Phys. Rev. B, 68, 174518 (2003)] over the range 250 to 450 nK below the transition. There is no gravity rounding because the entire sample is at the same reduced temperature tSOC(Q). Closer to T λ the SOC specific heat falls slightly below LPE, reaching a maximum at approximately 50 nK below Tλ, in agreement with theoretical predictions [R. Haussmann, Phys. Rev. B, 60, 12349 (1999)].

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages137-138
Number of pages2
DOIs
StatePublished - 2006
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: Aug 10 2006Oct 17 2006

Publication series

NameAIP Conference Proceedings
Volume850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period08/10/0610/17/06

Keywords

  • Helium
  • Self-organized criticality
  • Specific heat
  • Superfluidity

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  • Cite this

    Chatto, A. R., Lee, R. A. M., Duncan, R. V., Day, P. K., & Goodstein, D. L. (2006). Measurement of the SOC state specific heat in 4He. In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 137-138). (AIP Conference Proceedings; Vol. 850). https://doi.org/10.1063/1.2354640