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Cryogen-free one hundred microKelvin refrigerator

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arxiv 2010.04472 v2 pith:VNCGL32E submitted 2020-10-09 physics.ins-det cond-mat.mes-hall

classification physics.ins-detcond-mat.mes-hall
keywords microkelvinbelowcryogen-freedemagnetizationtemperaturefieldmagneticrefrigerator
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Temperature below 100 microKelvin is achieved in a customized cryogen-free dilution refrigerator with a copper-nuclear demagnetization stage. The lowest temperature of conduction electrons of the demagnetization stage is below 100 microKelvin as measured by a pulsed platinum NMR thermometer and the temperature can remain below 100 microKelvin for over 10 hours. An up to 9 T demagnetization magnetic field and an up to 12 T research magnetic field can be controlled independently, provided by a coaxial room-temperature-bore cryogen-free magnet.

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