A double-stage nuclear demagnetization refrigerator

Mueller, R. M.; Buchal, Christoph; Folle, H. R.; Kubota, Minoru; Pobell, F.

doi:10.1016/s0011-2275(80)80049-x

Cited by 93 publications

(25 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…nuclear ordering temperature (T ∼ 0.5 mK) 15,16 . In contrast, Cu can be demagnetized down to the low µK regime and it is very easy to work with and to machine, particularly compared to PrNi 5 .…”

Section: Nuclear Refrigerator Network Onmentioning

confidence: 99%

Magnetic cooling for microkelvin nanoelectronics on a cryofree platform

Palma

Maradan

Casparis

et al. 2017

Review of Scientific Instruments

View full text Add to dashboard Cite

We present a parallel network of 16 demagnetization refrigerators mounted on a cryofree dilution refrigerator aimed to cool nanoelectronic devices to sub-millikelvin temperatures. To measure the refrigerator temperature, the thermal motion of electrons in a Ag wirethermalized by a spot-weld to one of the Cu nuclear refrigerators -is inductively picked-up by a superconducting gradiometer and amplified by a SQUID mounted at 4 K. The noise thermometer as well as other thermometers are used to characterize the performance of the system, finding magnetic field independent heat-leaks of a few nW/mol, cold times of several days below 1 mK, and a lowest temperature of 150 µK of one of the nuclear stages in a final field of 80 mT, close to the intrinsic SQUID noise of about 100 µK. A simple thermal model of the system capturing the nuclear refrigerator, heat leaks, as well as thermal and Korringa links describes the main features very well, including rather high refrigerator efficiencies typically above 80 %.

show abstract

Section: Nuclear Refrigerator Network Onmentioning

confidence: 99%

Magnetic cooling for microkelvin nanoelectronics on a cryofree platform

Palma

Maradan

Casparis

et al. 2017

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…Details of the refrigeration, thermometry, and measuring techniques can be found in our relevant publications, in particular Refs. [3,6,8,9]. Fig.…”

Section: Experimental Methods At Microkelvin Temperaturesmentioning

confidence: 98%

“…The experiments to be described in this article have been performed in the double-stage nuclear refrigerators at the Forschungszentrum (formerly: Kernforschungsanlage) Jülich [8] and at the University of Bayreuth [9]. They were the most powerful refrigerators for the microkelvin temperature range, with minimum temperatures of 38 µK achieved in Jülich in 1979 [8], as well as 12 µK in 1987 [9] and 1.5 µK in 1995 [10] in Bayreuth.…”

Section: Experimental Methods At Microkelvin Temperaturesmentioning

confidence: 99%

“…They were the most powerful refrigerators for the microkelvin temperature range, with minimum temperatures of 38 µK achieved in Jülich in 1979 [8], as well as 12 µK in 1987 [9] and 1.5 µK in 1995 [10] in Bayreuth. All these temperatures as well as all the temperatures mentioned in this article are equilibrium temperatures (T electron =T phonon =T nuclei ) measured at metallic samples refrigerated in these apparatus.…”

Section: Experimental Methods At Microkelvin Temperaturesmentioning

confidence: 99%

“…The Pt nuclear susceptibility is calibrated by the electronic susceptibility of a Pd + 15 ppm Fe spin glass at T > 10 mK [3,9]. This spin glass thermometer eventually is calibrated by five superconducting transitions at 15 mK < T < 200 mK of the calibrated commercial superconductive fixed point device SRM 768 of NIST [3,8,9]. Fig.…”

Section: Experimental Methods At Microkelvin Temperaturesmentioning

confidence: 99%

See 2 more Smart Citations