We analyze the complex phenomenology of the nonclassical rotational inertia (NCRI) observed at low temperature in solid He-4 within the context of a two-dimensional Berezinskii-Kosterlitz-Thouless transition in a premelted He-4 film at the grain boundaries. We show that both the temperature and He-3 doping dependence of the NCRI fraction (NCRIF) can be ascribed to finite size effects induced by the finite grain size. We give an estimate of the average size of the grains which we argue to be limited by the isotopic He-3 impurities and we provide a simple power-law relation between the NCRIF and the He-3 concentration.

Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid He-4 and the role of He-3 impurities

Emmanuele Cappelluti;Gianluca Rastelli;Luciano Pietronero
2008

Abstract

We analyze the complex phenomenology of the nonclassical rotational inertia (NCRI) observed at low temperature in solid He-4 within the context of a two-dimensional Berezinskii-Kosterlitz-Thouless transition in a premelted He-4 film at the grain boundaries. We show that both the temperature and He-3 doping dependence of the NCRI fraction (NCRIF) can be ascribed to finite size effects induced by the finite grain size. We give an estimate of the average size of the grains which we argue to be limited by the isotopic He-3 impurities and we provide a simple power-law relation between the NCRIF and the He-3 concentration.
2008
Istituto dei Sistemi Complessi - ISC
INFM
SUPERFLUID TRANSITION
HELIUM
FILMS
DYNAMICS
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Descrizione: Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid He-4 and the role of He-3 impurities
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/159051
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