We analyze the complex phenomenology of the nonclassical rotational inertia (NCRI) observed at low temperature in solid (4)He within the context of a two-dimensional Berezinskii-Kosterlitz-Thouless transition in a premelted (4)He film at the grain boundaries. We show that both the temperature and (3)He 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 (3)He impurities and we provide a simple power-law relation between the NCRIF and the (3)He concentration.
Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid 4He and the role of 3He impurities / S., Gaudio; E., Cappelluti; G., Rastelli; Pietronero, Luciano. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 101(7):(2008), pp. 075301-075304. [10.1103/PhysRevLett.101.075301]
Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid 4He and the role of 3He impurities
PIETRONERO, Luciano
2008
Abstract
We analyze the complex phenomenology of the nonclassical rotational inertia (NCRI) observed at low temperature in solid (4)He within the context of a two-dimensional Berezinskii-Kosterlitz-Thouless transition in a premelted (4)He film at the grain boundaries. We show that both the temperature and (3)He 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 (3)He impurities and we provide a simple power-law relation between the NCRIF and the (3)He concentration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
