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Phase transitions and vortex structures in multicomponent superconductors
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
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 [en]
multicomponent superconductors, superconductivity, phase transitions, monte carlo, vortices, vortex structure formation, competing interactions
National Category
Condensed Matter Physics Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-177141ISBN: 978-91-7595-758-6 (print)OAI: oai:DiVA.org:kth-177141DiVA: diva2:871558
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
List of papers
1. Hierarchical structure foramtion in layered superconducting systems with multi-scale inter-vortex interactions
Open this publication in new window or tab >>Hierarchical structure foramtion in layered superconducting systems with multi-scale inter-vortex interactions
Show others...
2013 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 25, no 41, 415702- p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate the formation of hierarchical structures in two-dimensional systems with multiple length scales in the inter-particle interaction. These include states such as clusters of clusters, concentric rings, clusters inside a ring, and stripes in a cluster. We propose to realize such systems in vortex matter (where a vortex is mapped onto a particle with multi-scale interactions) in layered superconducting systems with varying inter-layer thicknesses and different layer materials.

Keyword
Vortices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-132201 (URN)10.1088/0953-8984/25/41/415702 (DOI)000324920400016 ()2-s2.0-84884851147 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20131025

Available from: 2013-10-25 Created: 2013-10-24 Last updated: 2017-12-06Bibliographically approved
2. Stripe, gossamer, and glassy phases in systems with strong nonpairwise interactions
Open this publication in new window or tab >>Stripe, gossamer, and glassy phases in systems with strong nonpairwise interactions
2013 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 88, no 4, 042305- p.Article in journal (Refereed) Published
Abstract [en]

We study structure formation in systems of classical particles in two dimensions with long-range attractive short-range repulsive two-body interactions and repulsive three-body interactions. Stripe, gossamer, and glass phases are found as a result of nonpairwise interaction.

Keyword
Superconductivity, Forces
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-133971 (URN)10.1103/PhysRevE.88.042305 (DOI)000326047800007 ()2-s2.0-84886029788 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20131115

Available from: 2013-11-15 Created: 2013-11-14 Last updated: 2017-12-06Bibliographically approved
3. Skyrmions induced by dissipationless drag in U(1)xU(1) superconductors
Open this publication in new window or tab >>Skyrmions induced by dissipationless drag in U(1)xU(1) superconductors
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 10, 104508- p.Article in journal (Refereed) Published
Abstract [en]

Rather generically, multicomponent superconductors and superfluids have intercomponent current-current interaction. We show that in superconductors with substantially strong intercomponent drag interaction, the topological defects which form in an external field are characterized by a skyrmionic topological charge. We then demonstrate that they can be distinguished from ordinary vortex matter by a very characteristic magnetization process due to the dipolar nature of inter-skyrmion forces. The results provide an experimental signature to confirm or rule out the formation p-wave state with reduced spin stiffness in p-wave superconductors.

Keyword
Lattices, Phases, Upt3
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-143682 (URN)10.1103/PhysRevB.89.104508 (DOI)000332459900006 ()2-s2.0-84897906225 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20140328

Available from: 2014-03-28 Created: 2014-03-27 Last updated: 2017-12-05Bibliographically approved
4. First order phase transition and tricritical point in multiband U(1) London superconductors
Open this publication in new window or tab >>First order phase transition and tricritical point in multiband U(1) London superconductors
(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:nbn:se:kth:diva-177172 (URN)
Note

QS 2015

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

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