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Surface of a He-3 crystal: Crossover from quantum to classical behavior.

Todoshchenko, Igor A. and Alles, Harry and Junes, Heikki J. and Parshin, Alexander Y. and Tsepelin, Viktor (2004) Surface of a He-3 crystal: Crossover from quantum to classical behavior. Physical Review Letters, 93 (17). p. 175301. ISSN 1079-7114

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Abstract

He-3 crystals start to show facets on their surface only at about 100 mK, well below the roughening transition temperature. To understand the reason for that, we have performed the first quantitative investigation on the growth dynamics of the basic (110) facet at 60-110 mK. The obtained values of the step free energy suggest an extremely weak coupling of the solid-liquid interface to the crystal lattice which we show to be the result of quantum fluctuations of the interface. The renormalization group approach by Nozieres and Gallet, modified to incorporate quantum fluctuations, explains well the temperature dependence of the step energy measured in this work and at ultralow temperatures by Tsepelin et al., where the coupling is known to be strong. We have thus shown that, paradoxically, the role of quantum fluctuations is at higher temperatures much larger than at low temperature.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Uncontrolled Keywords: SOLID HE-3 ; INTERFACE ; GROWTH ; LIQUID-HE-3 ; TRANSITION ; MOBILITY ; SHAPE
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23523
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 09:48
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23523

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