Adsorption and superfluid onset of He films on intermediate strength substrates |
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Authors: | J E Rutledge J A Phillips and P Taborek |
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Institution: | a Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, USA |
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Abstract: | On strong binding substrates, such as graphite or mylar that are wetted by 4He at all temperatures, an adsorbed 4He film consists of 2 atomic layers of “inert” helium covered by a liquid layer that becomes superfluid via a Kosterlitz–Thouless (KT) transition. On weak substrates, for example cesium, superfluid onset above the wetting temperature also conforms to the KT picture. In contrast, superfluid onset on intermediate strength substrates, specifically heavier alkali metals and monolyer films of cesium on gold, deviates strongly from KT behavior. Here we describe superfluid onset of 4He on intermediate strength substrates and discuss the contributions of weak bindings and disorder to the non-KT behavior. |
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Keywords: | Adsorption isotherms Superfluidity Wetting of helium |
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