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Influence of vortices and phase fluctuations on thermoelectric transport properties of superconductors in a magnetic field
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.ORCID iD: 0000-0002-9881-7857
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 83, no 17, 174502- p.Article in journal (Refereed) Published
Abstract [en]

We study heat transport and thermoelectric effects in two-dimensional superconductors in a magnetic field. These are modeled as granular Josephson-junction arrays, forming either regular or random lattices. We employ two different models for the dynamics: relaxational model-A dynamics or resistively and capacitively shunted Josephson junction dynamics. We derive expressions for the heat current in these models, which are then used in numerical simulations to calculate the heat conductivity and Nernst coefficient for different temperatures and magnetic fields. At low temperatures and zero magnetic field the heat conductivity in the RCSJ model is calculated analytically from a spin wave approximation, and is seen to have an anomalous logarithmic dependence on the system size, and also to diverge in the completely overdamped limit C -> 0. From our simulations we find at low magnetic fields that the Nernst signal displays a characteristic "tilted hill" profile similar to experiments and a nonmonotonic temperature dependence of the heat conductivity. We also investigate the effects of granularity and randomness, which become important for higher magnetic fields. In this regime geometric frustration strongly influences the results in both regular and random systems and leads to highly nontrivial magnetic field dependencies of the studied transport coefficients.

Place, publisher, year, edition, pages
2011. Vol. 83, no 17, 174502- p.
Keyword [en]
CONTINUOUS SYMMETRY GROUP; LONG-RANGE ORDER; TYPE-2 SUPERCONDUCTORS; 2-DIMENSIONAL SYSTEMS; MIXED-STATE; DESTRUCTION; DYNAMICS; ARRAYS; NERNST
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-33958DOI: 10.1103/PhysRevB.83.174502ISI: 000290162000004Scopus ID: 2-s2.0-79961148271OAI: oai:DiVA.org:kth-33958DiVA: diva2:421610
Note
QC 20110609Available from: 2011-06-09 Created: 2011-05-23 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Phase fluctuation phenomena in superconductors
Open this publication in new window or tab >>Phase fluctuation phenomena in superconductors
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 65 p.
Series
Trita-FYS, ISSN 0280-316X ; 2012:28
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-95464 (URN)978-91-7501-380-0 (ISBN)
Public defence
2012-06-14, FB42, Albanova University Center, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120530Available from: 2012-05-30 Created: 2012-05-25 Last updated: 2012-05-30Bibliographically approved

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