2004/06/04 by Mukesh Tiwari, Animesh Datta, Tiwari, Mukesh +1
Physics and Astronomy · #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #cond-mat.other
paper · pdf · doi:10.48550/arxiv.cond-mat/0406124
4 pages, 2 figues, Revtex4
arxiv created 2004/06/04 · arxiv updated 2009/12/01
The probable observation of a supersolid helium phase was recently reported by Kim \it et al. In this article, we confirm their speculation. Based on a theoretical model for solid helium-4, we show that the emergence of such a phase is inevitable. This is the first instance of Bose-Einstein condensation (BEC) in a solid. We calculate the BEC transition temperature (Tc) and the Landau critical velocity (vc) from the model, which respectively are 215 mK and 251 μ\rmms-1. They are in excellent agreement with the experimental results; Tc=175 mK and vc ≤ 300 μ\rmms-1. We also prove that our model possesses the necessary and sufficient condition for the emergence of supersolidity. We briefly comment about similar behaviour in 3He.