Anomalous Nernst effect and heat transport by vortex vacancies in granular superconductors
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 81, no 6, 060508-1-060508-4 p.Article in journal (Refereed) Published
We study the Nernst effect due to vortex motion in two-dimensional granular superconductors using simulations with Langevin or resistively shunted Josephson-junction dynamics. In particular, we show that the geometric frustration of both regular and irregular granular materials can lead to thermally driven transport of vortices from colder to hotter regions, resulting in a sign reversal of the Nernst signal. We discuss the underlying mechanisms of this anomalous behavior in terms of heat transport by mobile vacancies in an otherwise pinned vortex lattice.
Place, publisher, year, edition, pages
2010. Vol. 81, no 6, 060508-1-060508-4 p.
IdentifiersURN: urn:nbn:se:kth:diva-19261DOI: 10.1103/PhysRevB.81.060508ISI: 000274998100026ScopusID: 2-s2.0-77954832190OAI: oai:DiVA.org:kth-19261DiVA: diva2:337308
FunderSwedish Research Council
QC 201005252010-08-052010-08-052012-05-30Bibliographically approved