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First order phase transition and tricritical point in multiband U(1) London superconductors
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The order of the superconducting phase transition is a classical problem. Single-component type-2 superconductors exhibit a continuous "inverted-XY" phase transition, as was first demonstrated for U(1) lattice London superconductors by a celebrated duality mapping with subsequent backing by numerical simulations. Here we study this problem in multiband U(1) London superconductors and find evidence that by contrast the model has a tricritical point. The superconducting phase transition becomes first-order when the Josephson length is sufficiently large compared to the magnetic field penetration length. We present evidence that the fluctuation-induced dipolar interaction between vortex loops makes the phase transition discontinuous. We discuss that this mechanism is also relevant for the phase transitions in multicomponent gauge theories with higher broken symmetry.

National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-177172OAI: oai:DiVA.org:kth-177172DiVA: diva2:871697
Note

QS 2015

Available from: 2015-11-16 Created: 2015-11-16 Last updated: 2015-11-17Bibliographically approved
In thesis
1. Phase transitions and vortex structures in multicomponent superconductors
Open this publication in new window or tab >>Phase transitions and vortex structures in multicomponent superconductors
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

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.
Series
TRITA-FYS, ISSN 0280-316X ; 2015:78
Keyword
multicomponent superconductors, superconductivity, phase transitions, monte carlo, vortices, vortex structure formation, competing interactions
National Category
Condensed Matter Physics Physical Sciences
Identifiers
urn:nbn:se:kth:diva-177141 (URN)978-91-7595-758-6 (ISBN)
Presentation
2015-12-07, FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20151117

Available from: 2015-11-17 Created: 2015-11-16 Last updated: 2015-11-17Bibliographically approved

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Citation style
  • apa
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