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Type-1.5 superconductivity in multicomponent systems
KTH, Skolan för teknikvetenskap (SCI), Fysik, Statistisk fysik.
2017 (engelsk)Inngår i: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 533, s. 20-35Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In general a superconducting state breaks multiple symmetries and, therefore, is characterized by several different coherence lengths i = 1,..., N. Moreover in multiband material even superconducting states that break only a single symmetry are nonetheless described, under certain conditions by multi component theories with multiple coherence lengths. As a result of that there can appear a state where some coherence lengths are smaller and some are larger than the magnetic field penetration length A: xi(1) <= xi(2)...<root 2 lambda < xi(M) <=... (N). That state was recently termed "type-1.5" superconductivity. This breakdown of type-1/type-2 dichotomy is rather generic near a phase transition between superconducting states with different symmetries. The examples include the transitions between U(1) and U(1) x U(1) states or between U(1) and U(1) x Z(2) states. The later example is realized in systems that feature transition between s-wave and s + is states. The extra fundamental length scales have many physical consequences. In particular in these regimes vortices can attract one another at long range but repel at shorter ranges. Such a system can form vortex clusters in low magnetic fields. The vortex clustering in the type 1.5 regime gives rise to many physical effects, ranging from macroscopic phase separation in domains of different broken symmetries, to unusual transport properties. Prepared for the proceedings of Vortex IX conference, Rhodes 12-17 September 2015.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE BV , 2017. Vol. 533, s. 20-35
Emneord [en]
Multi-component superconductor, Multiband superconductor, Type-1.5 superconductor, Vortex clusters, Attractive intervortex interaction
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Identifikatorer
URN: urn:nbn:se:kth:diva-205072DOI: 10.1016/j.physc.2016.08.003ISI: 000395954100004Scopus ID: 2-s2.0-84994682203OAI: oai:DiVA.org:kth-205072DiVA, id: diva2:1115213
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QC 20170626

Tilgjengelig fra: 2017-06-26 Laget: 2017-06-26 Sist oppdatert: 2017-11-07bibliografisk kontrollert

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