Advanced Data Reduction and Control of High-Precision Low-Temperature Experiments

Sergatskov, Dmitri; Liu, J.; Li, Q.; Duncan, R. V.

doi:10.1007/s10909-005-2323-y

Cited by 6 publications

(7 citation statements)

References 2 publications

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“…Analyzing the nonlinear diffusive equation (10), Weichman and Miller 26 also predicted a new thermal wave propagating only upward in self-organized normal states. This wave was observed both above and below the lambda line 20,21 .…”

Section: Introductionmentioning

confidence: 90%

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Self-organization inH4enear the superfluid transition in heat flow and gravity

Yabunaka

Ōnuki

2010

Phys. Rev. B

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We investigate the nonlinear dynamics of 4 He slightly below the superfluid transition by integrating model F equations in three dimensions. When a superfluid is heated from above under gravity, a vortex tangle and sheetlike phase slips both appear near the bottom plate. Then a self-organized superfluid containing high-density vortices and phase slips grows upward, where high-amplitude second sounds are emitted from the self-organized to the ordinary superfluid region. A phase slip sheet often changes into a vortex aggregate and vice versa. The thermal resistance due to these defects produces a constant temperature gradient equal to the gradient of the pressure-dependent transition temperature T λ (p). In this self-organized region, the temperature deviation T − T λ (p) consists of a negative constant determined by the heat flux Q and time-dependent fluctuations. Its time-average is calculated to be 155 nK for Q = 11.2 erg/cm 2 s in good agreement with the experiment (W.A. Moeur et al., Phys. Rev. Lett. 78, 2421(1997).

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Section: Introductionmentioning

confidence: 90%

“…On the other hand, if heated from above, they can compete to produce new nonequilibrium states. In fact, Moeur et al [19][20][21] realized selforganized superfluid in 4 He heated from above, where the temperature gradient and the gradient of T λ (p) were balanced as…”

Section: Introductionmentioning

confidence: 99%

Self-organization inH4enear the superfluid transition in heat flow and gravity

Yabunaka

Ōnuki

2010

Phys. Rev. B

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“…The depression of the superfluid transition temperature in 4 He by heat flow has been one of the most studied problems. A detailed prediction of the 𝜆-point shift was made by Onuki.…”

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confidence: 99%

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confidence: 99%

“…In recent years, our research team reported the realization of the lambda transition temperature of 4 He with a new sealed cell. [6−10] Owing to the dramatic change in thermal conductivity of 4 He when its temperature crosses the transition of superfluid (He II) and normal fluid (He I), the lambda transition temperature 𝑇 𝜆 is realized. To study the depression effect of the superfluid transition temperature in 4 He by a heat flow, four sealed cells have been used and twenty experiments were performed at the chinese national institute of metrology.…”

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Depression of the Superfluid Transition Temperature in ⁴ He by a Heat Flow

Liang¹,

Lin²,

Qi³

2014

Chinese Phys. Lett.

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The depression of the superfluid transition temperature 𝑇 𝜆 in 4 He by a heat flow 𝑄 is studied. A small sealed cell with a capillary is introduced and a stable and flat superfluid transition temperature plateau is easily obtained by controlling the temperature of the variable-temperature platform and the bottom chamber of the sealed cell. Owing to the depression effect of the superfluid transition temperature by the heat flow, the heat flow through the capillary is changed by the temperature control to obtain multiple temperature plateaus of different heat flows. The thermometer self-heating effect, the residual heat leak of the 4.2 K environment, the temperature difference on the He II liquid column, the Kapiza thermal resistance between the liquid helium and the copper surface of the sealed cell, the temperature gradient of the sealed cell, the static pressure of the He II liquid column and other factors have influence on the depression effect and the influence is analyzed in detail. Twenty experiments of the depression of the superfluid transition temperature in 4 He by heat flow are made with four sealed cells in one year. The formula of the superfluid transition temperature pressured by the heat flow is 𝑇 𝜆 (𝑄) = −0.00000103𝑄 + 2.1769108, and covers the range 229 ≤ 𝑄 ≤ 6462 𝜇W/cm 2 .

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