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

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

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GAUDIO, Sergio, Emmanuele CAPPELLUTI, Gianluca RASTELLI, Luciano PIETRONERO, 2008. Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid 4He and the role of 3He impurities. In: Physical review letters. 101(7), 075301. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.101.075301

@article{Gaudio2008-08-15Finit-46920, title={Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid 4He and the role of 3He impurities}, year={2008}, doi={10.1103/PhysRevLett.101.075301}, number={7}, volume={101}, issn={0031-9007}, journal={Physical review letters}, author={Gaudio, Sergio and Cappelluti, Emmanuele and Rastelli, Gianluca and Pietronero, Luciano}, note={Article Number: 075301} }

2019-09-18T08:22:41Z 2019-09-18T08:22:41Z eng Gaudio, Sergio Pietronero, Luciano Gaudio, Sergio We analyze the complex phenomenology of the nonclassical rotational inertia (NCRI) observed at low temperature in solid <sup>4</sup>He within the context of a two-dimensional Berezinskii-Kosterlitz-Thouless transition in a premelted <sup>4</sup>He film at the grain boundaries. We show that both the temperature and <sup>3</sup>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 <sup>3</sup>He impurities and we provide a simple power-law relation between the NCRIF and the <sup>3</sup>He concentration. Cappelluti, Emmanuele Finite-size Berezinskii-Kosterlitz-Thouless transition at grain boundaries in solid <sup>4</sup>He and the role of <sup>3</sup>He impurities Pietronero, Luciano Cappelluti, Emmanuele Rastelli, Gianluca Rastelli, Gianluca 2008-08-15

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