Phase transitions and vortex structures in multicomponent superconductors
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Theoretical aspects of multicomponent superconductivity and systemswith competing interactions are studied using Monte Carlo techniques.Motivated by recent experimental and theoretical results of complex struc-ture formation of vortices in multicomponent systems, possible vortex struc-ture formations due to vortex interactions that are not purely attractive orrepulsive are considered. Vortex structures such as clusters, superclusters,hierarchical structure formation, stripes, gossamer patters, glassy phases, aswell as checkerboard lattices and loops are demonstrated to be possible.The order of the superconducting phase transition is considered for multi-component lattice London superconductors. The phase transition is demon-strated to be either rst-order or continuous depending on the strength of asymmetry-breaking Josephson intercomponent interaction. It is argued thatthe rst-order phase transition is caused by a vortex phase separation due toa uctuation-induced attractive interaction between vortex lines.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , 41 p.
TRITA-FYS, ISSN 0280-316X ; 2015:78
multicomponent superconductors, superconductivity, phase transitions, monte carlo, vortices, vortex structure formation, competing interactions
Condensed Matter Physics Physical Sciences
IdentifiersURN: urn:nbn:se:kth:diva-177141ISBN: 978-91-7595-758-6OAI: oai:DiVA.org:kth-177141DiVA: diva2:871558
2015-12-07, FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
de Wijn, Astrid S., Dr.
Babaev, Egor, Docent
QC 201511172015-11-172015-11-162015-11-17Bibliographically approved
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