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Fu, Haiying; Baddar, H.; Kuehn, Kerry; Larson, Melora; Mulders, N.; Schegolev, A.I.; Ahlers, Guenter

doi:10.1023/a:1022246124415

Cited by 18 publications

(3 citation statements)

References 13 publications

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“…High-resolution thermometers ͑HRTs͒ were developed by many groups [8][9][10][11][12] to study phase transitions in helium at low temperatures. The basic principle of operation is based upon the strong temperature dependence of the magnetization of a paramagnetic salt near its ferromagnetic transition in a magnetic field.…”

Section: Test Results and Discussionmentioning

confidence: 99%

Digital signal processor-based dc superconducting quantum interference device controller

Hahn

Weilert

2001

Review of Scientific Instruments

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Articles you may be interested inHigh slew rate, ultrastable direct-coupled readout for dc superconducting quantum interference devices Appl. Phys. Lett. 89, 063502 (2006); 10.1063/1.2335630 Frequency-domain multiplexed readout of transition-edge sensor arrays with a superconducting quantum interference device Appl. Phys. Lett. 86, 112511 (2005); 10.1063/1.1884746 High frequency ac bias for direct-coupled dc superconducting quantum interference device readout electronics Rev. Sci. Instrum. 74, 5189 (2003); 10.1063/1.1622982 Sensitivity enhancement of Quantum Design dc superconducting quantum interference devices in two-stage configuration Rev. Sci. Instrum. 72, 3694 (2001); 10.1063/1.1389496 A modular, low-cost, digital signal processor-based lock-in card for measuring optical attenuation Rev. Sci. Instrum. 72, 247 (2001);

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Section: Test Results and Discussionmentioning

confidence: 99%

Digital signal processor-based dc superconducting quantum interference device controller

Hahn

Weilert

2001

Review of Scientific Instruments

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“…However, thermodynamic temperature determination (based on the fundamental properties of thermal fluctuations in conductors) remains a complex and heavy task, for example, the resolution at room temperature of a commercially available Johnson noise thermometer is about 100 mK, reaching micro-Kelvin resolution at cryogenic operation temperatures . At low temperature (4 K), the measurement sensitivity can be improved by using a dc-SQUID magnetometer to determine the change in magnetization of a paramagnetic salt, reaching a resolution of about 100 pK, or by using the Coulomb blockade technique to measure the tunnel current in between metallic islands surrounded by an insulator . However, the applicability of these cryogenic techniques is very limited, and they need electrical interactions with the sample through electrical contacts.…”

Section: Introductionmentioning

confidence: 99%

Micro-Kelvin Resolution at Room Temperature Using Nanomechanical Thermometry

et al. 2021

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Ultrahigh sensitivity temperature measurement is becoming increasingly relevant for different scientific and technological fields from fundamental physics to high-precision engineering applications. Here, we demonstrate the use of a nanomechanical resonator—free standing silicon nitride membranes with thicknesses in the nanoscale—for room temperature thermometry reaching an unprecedented resolution of 15 μK. These devices were characterized by using an interferometric system at high vacuum, where there are only two possible mechanisms for heat transfer: thermal conductivity and radiation. While the expected behavior should be to decrease the frequency of the mechanical resonance due to the thermoelastic effect, we observe that the nanomechanical response can be both positive and negative depending on the thermal flux: a heat point source always shifts the mechanical resonance to lower frequencies, while a distributed heat source shifts the resonance to higher frequencies.

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“…The temperatures of the top (T t ), bottom (T b ), and the two sideplanes (T st and T sb ) were measured with nano-K resolution [17]. In each case the fill capillary came from an overflow volume containing the liquid-vapor interface on an isothermal shield which was kept at a temperature near 2.2 K and steady to ±1µK [18].…”

mentioning

confidence: 99%

Singularity in the Thermal Boundary Resistance between SuperfluidH4eand a Solid Surface

Kuehn

Mehta

et al. 2002

Phys. Rev. Lett.

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We report new measurements in four cells of the thermal boundary resistance R between copper and (4)He below but near the superfluid-transition temperature T(lambda). For 10(-7)< or =t identical to 1-T/T(lambda))< or =10(-4) fits of R = R(0)t(-x(b))+R(B) to the data yielded x(b) approximately equal to 0.18, whereas a fit to theoretical values based on the renormalization-group theory yielded x(b) = 0.23. Alternatively, a good fit of the theory to the data could be obtained if the amplitude of the prediction was reduced by a factor close to 2. The results raise the question whether the boundary conditions used in the theory should be modified.

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Cited by 18 publications

References 13 publications

Digital signal processor-based dc superconducting quantum interference device controller

Digital signal processor-based dc superconducting quantum interference device controller

Micro-Kelvin Resolution at Room Temperature Using Nanomechanical Thermometry

Singularity in the Thermal Boundary Resistance between SuperfluidH4eand a Solid Surface

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