Specific Heat and Superfluid Density of 4He near T λ of a 33.6 nm Film Formed Between Si Wafers

Perron, Justin K.; Gasparini, Francis M.

doi:10.1007/s10909-012-0795-0

J Low Temp Phys

2012

DOI: 10.1007/s10909-012-0795-0

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Specific Heat and Superfluid Density of 4He near T λ of a 33.6 nm Film Formed Between Si Wafers

Justin K. Perron

Francis M. Gasparini

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Cited by 2 publications

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Theory of Adiabatic Fountain Resonance

Williams

2017

J Low Temp Phys

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The theory of "Adiabatic Fountain Resonance" with superfluid 4 He is clarified. In this geometry a film region between two silicon wafers bonded at their outer edge opens up to a central region with a free surface. We find that the resonance in this system is not a Helmholtz resonance as claimed by Gasparini and co-workers, but in fact is a fourth sound resonance. We postulate that it occurs at relatively low frequency because the thin silicon wafers flex appreciably from the pressure oscillations of the sound wave.

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Theory of Adiabatic Fountain Resonance

Williams

2017

J Low Temp Phys

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A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: ⁴He near the superfluid transition

2019

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We review measurements of 4 He near the superfluid transition in arrangements whereby an array of weak links couple relatively larger, more bulk-like 4 He regions. In contrast to experiments which focus on the dependence of the superflow on the chemical potential difference across the links, these studies focus on the specific heat of both the weak links and that of the larger coupled regions, as well as the behavior of the superfluid fraction within the weak links. The data show unexpected results which reflect a very long range coupling as well as modification of the weak link itself due to the proximity to bulk-like helium. One finds that while the three-dimensional correlation length ξ(t), where t = |1 − T/T λ |, is involved in these long-range effects, the distance over which these can be seen is of the order of 100 to 1000 times ξ(t). These results call into question our understanding of the meaning of the correlation length at a critical point as the 'range' over which information can propagate. These studies are the first to measure the thermodynamic properties of weak links for a critical system where fluctuations are important. They differ in essential ways with expectations from mean-field considerations. We compare results with other 4 He measurements, with superconductors and the theoretical calculations of the Ising model.

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Specific Heat and Superfluid Density of 4He near T λ of a 33.6 nm Film Formed Between Si Wafers

Cited by 2 publications

References 21 publications

Theory of Adiabatic Fountain Resonance

Theory of Adiabatic Fountain Resonance

A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: ⁴He near the superfluid transition

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Specific Heat and Superfluid Density of 4He near T λ of a 33.6 nm Film Formed Between Si Wafers

Cited by 2 publications

References 21 publications

Theory of Adiabatic Fountain Resonance

Theory of Adiabatic Fountain Resonance

A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: 4He near the superfluid transition

Contact Info

Product

Resources

About

A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: ⁴He near the superfluid transition