Abstract
When immersed in liquid 3He, the nanometer strands of aerogel are coated with a thin layer of solid 3He, forming a network of irregular nanotubes. Owing to its high purity and weak interactions, this system is ideal for studying fundamental processes. We report the first experiments on solid 3He in aerogel at ultralow temperatures, cooled by direct adiabatic demagnetization. Simultaneous nuclear magnetic susceptibility and heat capacity measurements indicate a magnetic phase transition.
Highlights
When immersed in liquid 3He, the nanometer strands of aerogel are coated with a thin layer of solid 3He, forming a network of irregular nanotubes
The extremely weak interatomic forces combined with almost absolute purity and the intrinsic nuclear spin of 1=2 make 3He attractive for studying fundamental physics in condensed matter systems, experiments are demanding owing to the small nuclear moment and the very low temperatures required
When immersed in liquid 3He, the strands become covered by a $1 nm layer of solid 3He atoms [5] forming a network of irregular nanotubes
Summary
When immersed in liquid 3He, the nanometer strands of aerogel are coated with a thin layer of solid 3He, forming a network of irregular nanotubes. Approximately constant down to T % 130 K below which the solid decouples from the superfluid at the top of the radiator (see below), so the same lowest temperature of Tmin ’ 113 K is obtained regardless of the final field.
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