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Klemme, B.; Adriaans, M.J.; Day, Peter; Sergatskov, Dmitri; Aselage, T. L.; Duncan, R. V.

doi:10.1023/a:1021883011172

Cited by 28 publications

(9 citation statements)

References 11 publications

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“…The source of noise in these thermometers has been accounted for in terms of fundamental noise sources, such as fluctuation-dissipation noise, thermally induced eddy current noise, and SQUID noise. As reported previously [6], these new devices display an enhanced sensitivity due to the itinerant electrons in the Pd that are correlated by the dilute Mn ions to create an exceptionally large effective magnetic moment, greatly enhancing the magnitude of the paramagnetic susceptibility of these materials [9].…”

Section: Introductionsupporting

confidence: 58%

“…As discussed by other authors [6,11], the thermodynamic fluctuation noise of these paramagnetic susceptibility thermometers scales as R, where R is the total thermal resistance (measured, for example, in kelvins per watt) between the PdMn thermometric element and the sample. This noise source is independent of the heat capacity of the PdMn, so the reduction of this noise source depends on minimizing this thermal resistance.…”

Section: Thermometer Design Assembly and Performancementioning

confidence: 90%

“…These devices have been used to explore new effects within quantum liquids on the ground, such as the elucidation of the self-organized heat-flow state [3], the mapping of the nonlinear heat-transport region [4], and the detection of new diffusion waves [5], all near the superfluid transition in 4 He. A detailed report of these new devices, including a first-principles analysis of their noise performance, has been published previously [6]. Techniques were described at the end of Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Techniques were described at the end of Ref. [6] to improve the performance of these devices. Here we report on the experimental realization of these improvements, and we provide a guide to the construction of these devices.…”

Section: Introductionmentioning

confidence: 99%

“…A superconducting flux transformer wound around this PdMn is coupled to the input of a superconducting quantum interference device (SQUID), as discussed in Ref. [6]. This thermometric element is operated slightly above its Curie temperature, where the magnetic susceptibility of the PdMn is strongly temperature dependent.…”

Section: Introductionmentioning

confidence: 99%

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New Paramagnetic Susceptibility Thermometers for Fundamental Physics Measurements

Sergatskov¹,

Day

Бабкин³

et al. 2003

AIP Conference Proceedings

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Abstract. New paramagnetic susceptibility thermometers have been developed for use in fundamental physics missions in earth orbit. These devices use a SQUID magnetometer to measure the variation in the dc magnetization of a thermometric element that consists of a dilute concentration of manganese in a palladium matrix. Near 2.2 K these new PdMn thermometers have demonstrated a temperature resolution of better than 100 pK/ Hz and a time constant of 50 ms when operated with a 50 K/W thermal resistance to the liquid helium sample. These thermometers have been observed to be remarkably stable, with a drift of less than 10 fK/s. The observed power spectral density of the noise from these thermometers is consistent with separate measurements of the device's time constant and thermal standoff from the bath. Recently these PdMn materials have been made into thin films and microstructures for use in future studies of quantum liquids, and for possible use in a new class of bolometers and radiometers. These thermometers have been integrated into an experimental cell and thermal isolation network that are adequate to keep stray heats stable to within a few picowatts, with no systematic temperature errors greater than 60 pK, over the course of a planned fundamental physics experiment on Earth orbit.

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Section: Introductionsupporting

confidence: 58%

Section: Thermometer Design Assembly and Performancementioning

confidence: 90%