Journal
PHYSICA B-CONDENSED MATTER
Volume 404, Issue 3-4, Pages 521-523Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2008.11.055
Keywords
Superfluidity; Supersolidity; Worm algorithm
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The discovery of the phenomenon of supersolidity in helium, a non-dissipative transport of (4)He-atoms through (4)He-crystals, is an amazing achievement in the low-temperature physics. A microscopic interpretation of the phenomenon of non-classical rotational inertia originally discovered by Kim and Chan remains highly controversial. The only direct observation of a superflow through solid (4)He is the one reported recently by Ray and Hallock. First-principle simulations by Amherst-ETH-Alberta-CUNY collaboration, while unquestionably showing that a perfect hcp (4)He crystal is not a supersolid, reveal disordered mechanisms of supersoliclity: superfluid dislocations, grain boundaries, and ridges. Also possible is a metastable amorphous supersolid, the so-called superglass. (C) 2008 Elsevier B.V. All rights reserved.
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