Journal
PHYSICAL REVIEW LETTERS
Volume 98, Issue 13, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.135301
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Funding
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [844115] Funding Source: National Science Foundation
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By large-scale quantum Monte Carlo simulations we show that grain boundaries in He-4 crystals are generically superfluid at low temperature, with a transition temperature of the order of similar to 0.5 K at the melting pressure; nonsuperfluid grain boundaries are found only for special orientations of the grains. We also find that close vicinity to the melting line is not a necessary condition for superfluid grain boundaries, and a grain boundary in direct contact with the superfluid liquid at the melting curve is found to be mechanically stable and the grain-boundary superfluidity observed by Sasaki et al. [Science 313, 1098 (2006)] is not just a crack filled with superfluid.
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