Superfluid transition in a correlated defect network
2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 21, 214520- p.Article in journal (Refereed) Published
Motivated by recent experiments on the possible supersolid behavior of He-4 solids at low temperature, we consider a model of superfluidity in a defected solid containing a system spanning network of correlated linear dislocations, or planar grain boundaries. Using arguments based on the Harris criterion, as well as numerical simulations, we find that such correlated quenched disorder shifts the familiar superfluid lambda transition to a new disordered universality class in which the correlation length exponent nu >= 1. This results in the temperature derivatives for the superfluid density d rho(s)/dT and for the heat capacity dc/dT remaining finite at the transition T-c, and thus a less singular transition, profoundly different from the usual lambda transition.
Place, publisher, year, edition, pages
2013. Vol. 87, no 21, 214520- p.
Shear Modulus, Helium, Supersolidity, Systems, He-4
IdentifiersURN: urn:nbn:se:kth:diva-124723DOI: 10.1103/PhysRevB.87.214520ISI: 000320999500003ScopusID: 2-s2.0-84879697641OAI: oai:DiVA.org:kth-124723DiVA: diva2:638350
FunderSwedish Research Council
QC 20130730. Updated from "Manuscript" to "Article"2013-07-302013-07-292015-03-06Bibliographically approved